Which gasoline burns better 92 or 95. Which gasoline is better to fill? What are these numbers

I hope you have read the first part of the article about and are no longer demonizing it. The shortcomings of gasoline were also mentioned, but many other prejudices remained outside the discussion, both with a rational explanation and completely unfounded. Let's see, what else are we too often mistaken about?

"Pour the 98th sometimes!"

It's no secret that there are modern motors. It seems that the manufacturer is reporting about new technologies, but in reality there are more and more problems, and now a five-year-old car is not a welcome purchase, but an object of large "infusions" of funds and a potential source of problems. And the owner of the car, as always, is left alone with them. The manufacturer insists that the car is excellent - it eats little gasoline, and is environmentally friendly, and how reliable it is, according to all reports, it's just brilliance, a minimum of failures. And there are rumors on these Internet sites, and for some reason the dealer sometimes insistently advises to fill in 98th gasoline sometimes, to "clean" the engine and generally for prophylaxis. And you know, the dealer is right in his own way. After all, engine flaws, operating flaws can be compensated in different ways. You can improve the engine, or you can just add oil and refuel with higher octane gasoline. But it has nothing to do with cleaning the motor.

How does 98th gasoline differ from 95th gasoline? Purely theoretically - octane number. Detergent properties, fluidity, volatility - all these parameters will be approximately close. Moreover, there are options when the 98th gasoline is really just the same base as the 95th, but with additives.

But you don't need to joyfully pour into your car, where “Only 98RON”, 95th gasoline, is absolutely unconditionally affirmed on the gas filler flap, motivating this act with the logic “if you don’t see the difference, why pay more?”. The difference can be seen. And I am not saying that they are equivalent, because there is a difference in the octane number, and it can often be decisive.

For example, for often it results in tens of thousands of "extra" mileage before the rotors are overhauled, and on turbocharged cars, often on 95th gasoline, the engine will be able to live only until the first long "pushing the slipper". Why does your dealer (eg Audi) advise you to “refuel the 98 sometimes”?

As I said, this action has a practical meaning. By mixing the 95th and 98th gasoline, we get something in between, often in terms of characteristics closer to the AI-98 than to the AI-95. We will deliberately cover the octane number requirements of the automaker. And it is no longer so important that the motor overheats a little because of dirty radiators, a faulty thermostat, "buggy" sensors, and worthwhile crankcase protection. That the octane number of gasoline falls due to oil flying through a long clogged ventilation system, because piston rings long gone ...

And now, the gasoline is better, we really extended the life of the engine - it spins better, the effect is obvious. But wouldn't it be better to tidy it up in a more traditional way? And, of course, there will be nothing to wash the 98th gasoline, the increased price does not mean increased secondary characteristics.

Moreover, when using some anti-knock additives, the likelihood of coking injectors even increases, for example, MMA (monomethylamine) and the like can cause such an effect - and even if this additive is not used in large network filling stations, anything is possible in the periphery.

The only really worthwhile reason to fill the tank of 98 gasoline is a trip to the track or just for a good "fire". If the engine just coked a little, but the cooling system is still alive, the sensors are normal, then the carbon deposits will recede, the ring mobility will be restored, the valves will turn over and press harder on the seats, and the engine will become a little better after a long standing in traffic jams. But then you really need to pour the 98th constantly, and not from time to time.

Who has more octane?

I think the readers of the site are already aware of why it is impossible to pour gasoline into the 92nd, despite the fact that some 91st is clearly indicated on the hatch. Their “91 AKI” is gasoline, which has an average octane number according to the engine and research method equal to 91. In our country, brands are assigned only according to the research method - hence the letter “I” in the name “AI-92”. In our reality, 91 AKI is, rather, the 95th and higher, and not the 92nd at all.

And even if the neighbor's Audi 2.7 turbo has been driving the 92 for a year, and he is happy with the savings, this savings is like a lottery. Maybe the engine will get bad now, or maybe from one of the next owners - in any case, your neighbor borrows from the engine resource and someday this money will have to be given back. The reality is that the sound insulation of cars has long been too good for the driver to hear detonation, and the engines, even atmospheric ones, are forced so much that it is possible at any load.

In addition, modern multistage transmissions directly provoke the engine to operate in the most dangerous modes from this point of view, with low revs and high load. Almost all engines produced in the 21st century have four valves per cylinder, a controlled thermostat and engine temperature by Idling- over a hundred degrees, and a good half of them are also turbocharged. This means that the risk of knocking is increased on all modern engines, especially when the engine is loaded after a prolonged “warm-up” at idle.

In general, if your motor has a controlled thermostat according to your passport, you often stand in traffic jams, or you have a turbocharger, then, believe me, the 98th really will not hurt you. Even if it says on the gas filler flap that the 95th will fit the car. It's just that where they made it, they counted on more meticulous service, cleaner air and the absence of hours-long traffic jams, in which standing alternates with acceleration up to a hundred.

A savvy reader will say that there is no need to be afraid of detonation, because the car has appropriate sensors, and the control system must prevent it, but in practice everything turns out to be a little more complicated. Firstly, almost all systems use sound knock sensors, which means that a knock must appear in order for the system to detect it. Then it still takes time to change the parameters of the motor.

Detonation, perhaps, will disappear immediately, or perhaps not. In any case, soon the control system will try again to switch to the optimal ignition angles and throttle opening speed, and if the engine is not entirely in order, and the gasoline is not the same, then the detonation will appear again, and the process will be repeated.

But the main problem is not even detonation at medium speeds, but in the troubles that lie in wait for the engine at high speeds. In most cases, the knock sensor simply turns off after a certain speed has been set, because the internal noise of the engine increases, and the sensor becomes useless. Theoretically, the border of the knock zone goes very far from the optimal one, and it is almost safe. But if the engine overheats, the lambda probe is lying, the fuel pump or pressure regulator is faulty, then detonation will still occur, and the consequences will be dire. Usually this is a complete failure of the engine: a punctured cylinder block - a "fist of friendship", a crankshaft wrapped in a knot and scattered pistons and connecting rods.

Unfortunately, not everyone can hear the impending wave of troubles in time. So far, the rare systems that determine detonation at any speed by ionization in the cylinder are used mainly on very high-powered engines, and they were installed massively on all cars only by the deceased in the Bose. In general, detonation is quite possible. By the way, there is no point in listening to the engine running on idle... As long as the load is small and the cylinder filling ratio is low, there are a lot of residual gases, and there will simply be no detonation. Likewise, for old turbocharged engines with a reduced compression ratio - there will be no knocking at low load, but this does not mean that it will not appear if you press the gas pedal slightly.

Many overly modern drivers believe that a direct injection engine can "digest" almost 80-th gasoline without any consequences. These bikes have been in use, probably since the time of the delivery of GDI engines from Mitsubishi to the Far East and attempts to “save money”. But I'm afraid that if even the 92nd is poured into a modern turbo engine with direct injection, then nothing good will happen. Moreover, the risk of damage to very expensive injectors increases.

Biofuels and all-all-all

You will probably be interested to know that in Europe it is possible to refuel very inexpensively with gasoline with an octane rating of 102-110. And this is gas, compressed or liquefied, not revered by many in our country. This is E85 biofuel, containing 85 percent ethyl alcohol. The slightly lower calorie content is more than compensated by the increasing engine output, only slightly more powerful nozzles are needed. True, pouring it into an unprepared car is not worth it.

Most FlexFuel machines that use this fuel are specially designed for this. They have a large injector performance, a wider range of lambda sensors and, most importantly, the control system can recognize less calorie fuel. In addition, there is also a more corrosion-resistant power system, but this is not so important.

If you suddenly want to fill up the "inexpensive" 105th gasoline, then it is better to give up this venture, because an unprepared engine can simply break down. And in the best case, the consumption will be such that it will block all possible savings, and the detonation resistance of the fuel will be low due to the depletion of the mixture.

For the same reason, you shouldn't pour alcohol into gasoline trying to raise its octane number. Any change in the calorific value of the fuel that goes beyond the regulation by the lambda sensor and is usually about 10-15% is highly undesirable. The situation can be saved by tuning specialists, they will tune the engine to any fuel, but this is a one-way path - for the full use of E85 mixtures with gasoline and ethanol additives, an advanced control system is needed that can determine the alcohol content in the tank.

E85 fuel is also characterized by a beneficial effect on engines, because alcohol does not wash off the fuel film, it cools the valves better (just due to the higher latent heat of combustion, the OCH is higher) and is much more loyal to catalysts. That is why cars from Europe may end up in best condition than their "closest relatives" we have. And the point here is not that we have bad gasoline, but that we have gasoline, and they have 85 percent alcohol.

In general, if you are not sure, do not pour alcohol into the gas tank. But acetone, by the way, is possible. This is also a good anti-knock additive. Although MTBE is much more effective and not so harmful to the environment. But this, as they say, is a completely different story.

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Hello everyone, today under the heading "Which is better?" we will talk about painful, namely that which gasoline is better pour into the tank A-95 or A-92. In the article, we will weigh all the pros and cons of each of the applicants and summarize so that you can make the right choice of fuel for your car. It would seem that everything is very simple; what is more expensive or what is indicated in technical characteristics car manufacturer. In principle, all over the world, this is exactly what everyone does, but in our country it is not always possible to believe what is written, therefore, the 95th gasoline recommended by the manufacturer is not always hidden under the AI-95 brand. Given this fact, it is not surprising that many motorists do not want to overpay for an imaginary quality. And if, moreover, we are talking about gas stations on the outskirts, where there is no quality control as such, instead of the same 92nd you can be poured whatever you want and then it will be very difficult for you to prove anything. "Badyazhat" everything, the only question is how much, and this already depends on the conscience of the same owner of the gas station or lack thereof. Although what kind of conscience can there be in the matter of "swindle"? What happens after you pour poor quality gasoline into your tank, probably everyone knows, the result depends on many factors. Firstly, how much will you refuel this gasoline, secondly, how long will you refuel with this fuel, and thirdly - what type of engine you have. One thing is for sure, that in any case nothing good awaits you with such fuel.

Which gasoline is better everyone decides for himself, guided by some of his knowledge, 92 or 95 or perhaps 95 with the prefix "Energy", "Pulse", "Mustang", etc. Therefore, my article today is nothing more than a discussion on a topic, rather than what is a clear instruction that must be followed. After walking around the forums and listening to real people who give advice based on my own experience, I have formed my own opinion and view on the question "Which gasoline is better 92 or 95? ". If you are interested, then keep reading ... If not, thanks for stopping by!

I will say right away that you should not be fooled by the above-mentioned English-language consoles, in most cases this is just a marketing ploy for those who believe that after refueling their Zhiguli it will drive like a Mustang. Although there are gas stations where "fashionable" gasoline, let's call it that, justifies its name, after filling such fuel, the car goes better and faster. But what's good for one motor isn't always good for another. Therefore, the high octane number of "fashionable" gasoline in some cases can do more harm than "weakened" 92nd.

The main differences between the 92nd and the 95th

These two brands of gasoline are most in demand by motorists, they certainly differ from each other, otherwise why would they then be divided into two classes.

The first difference is the octane number. In the 92nd, this number will be lower, but this does not mean that the quality of gasoline will be the same. The quality will just be normal, since the 92nd among specialists is considered to be cleaner than the 95th. The latter, by the way, if anyone did not know they did it from the 92nd by adding various additives and additives that increase the octane number, this method is considered legal when oil refineries do it. Although there are often cases when not clean on hand operators of gas stations or even their owners do this operation themselves, thereby "inflating" the consumer. The quality of such a 95th leaves much to be desired, but it is beneficial from a financial point of view for the filling stations themselves.

It is certainly necessary to adhere to the recommendations that the manufacturer of your car indicated in the operating manual, but not everyone has this manual, this is especially true for used cars that are more than 10-15 years old. In addition, as we have already said, if the 95th is recommended for you, but you see and hear that the car rides better on the 92nd, moreover, if we take into account the fact of "loosening" the fuel at gas stations, then I think that in this situation you can deviate from the rules.

If you are pursuing a different goal, for example, and fill in the 92nd knowing that the manufacturer of your car clearly indicated that it is necessary to fill the 95th only because it is cheaper, then you should think about this. The fact is that the higher the octane number, the lower the ignition temperature of gasoline. Therefore, refueling the 92nd, you, perhaps without knowing it, raise the ignition temperature of the fuel, which in itself is not good, since parts that are temperature-dependent (pistons, valves, gaskets, oil seals etc.). I think nothing will happen from one or two gas stations, but if it becomes a habit and you deliberately pour yourself the 92nd, then how not to twist unscheduled or separate parts of it are guaranteed to you. That is why if the 95th is provided for your car, pouring the 92nd into the tank is strongly discouraged, at least when it comes to regular refueling.

What happens if you mix 92-1 and 95th gasoline?

In the opinion of the socialists and minders, it is impossible to mix the two types of AI-92 and AI-95 fuel because, despite the fact that both types of fuel belong to the same class, they hardly mix with each other in the tank. Such a "mix" in the opinion of some convinced "carriers" allows you to save on fuel, but this is not the case. "Mixing" two types of fuel can harm the engine, since each fuel has its own density and, if refueled in a one-to-one ratio, the AI-92 will sink to the bottom of the tank, and the 95th will rise up. Ultimately, your motor will first run on 92, and then on 95, that is, you will get the above effect when you drive a 92, despite the fact that the manufacturer has clearly told you to use a 95.

If the engine of your car should consume 92 or higher, then in principle you can pour the 5th gasoline without much harm, because of this you should not suffer much, moreover, according to the minders and experienced motorists, the traction and engine operation are improved ...

Let's summarize

If you don't know which gasoline is better than 92 or 95, pour into the tank what the automaker recommends, if the manufacturer indicated that you can use AI-95 or AI-92 - do at your own discretion, pour what you like best from a financial point of view.

If you are faced with the fact that you have zero fuel, and there is only 92nd next to you, but only 95 is suitable for you, then it is better not to risk it, except in case of emergency.

If you keep refueling on the 92nd, but there is no such gasoline at the gas station, you can safely pour the 95th, there will be no harm from such a one-time refueling. If, while driving in the 95th, you liked the work of the engine and the dynamics of the car, in other words, you are thinking about switching to a new gasoline with a higher octane number, consult your car manufacturer's dealer or at least minders. Be careful and careful, because in some cases the 95th flooded instead of the 2nd leads to a malfunction of the engine, valves appear.

That's all for me, I hope I answered your questions, and now you know exactly the answer to the questions of which gasoline is better 92 or 95 and whether it is possible to mix fuels of different brands. Thanks to those who have mastered the article to the end, and even more thanks to those who supplemented me or liked it using the buttons below. All the World, and see you again at.

Which is better to fill in gasoline, 92 or 95? This question is asked by many motorists driving along the roads of Russia. Is there a significant difference between the two fuels? Is it possible to harm the power unit if you use 92 instead of 95? After all, the cost of the first is much more attractive, so why not save on this? What gasoline is better to fill, let's try to figure it out in this article.

What is the difference between 92 and 95 fuels?

Both grades of fuel are in demand by drivers. Of course, they have a number of differences, because otherwise they would be sold at the same price and would not be divided into classes.

The main difference lies in the octane number. Class 92 fuel has a relatively low octane number, but this does not mean that the quality of gasoline will be the same. Experienced motorists consider this option to be cleaner. It is believed that fuel grade 95 is made from 92, adding additives to the mixture, which are designed to increase the octane number. This method of production of the 95th is considered legal if it is made in special enterprises. However, no one is immune from situations when employees of gas stations perform this procedure on their own in order to deceive and make money on a gullible buyer. The quality of such fuel, to put it mildly, is at a low level.

Compression ratio

When choosing a fuel, it is worth considering its tendency to spontaneous combustion - detonation. To increase engine power and reduce gasoline costs, manufacturers increase the compression level in the engine cylinders:

• For normal vehicle operation:
• With a compression ratio of up to 0.5, AI-92 should be used;
• 10.5-12 - AI 95!
• With a compression ratio of more than 12, it is necessary to use AI-98 gasoline;
• With a compression ratio of 14-16, AI 102 and 109, respectively, are poured into the tank.

For turbocharged engines, fuel with a high octane number is used.

What gasoline is better for refueling: what manufacturers say

When deciding which gasoline is better to drive, it is worth starting from what is written in the instructions. Manufacturers tend to designate this point. However, not every owner vehicle kept the manual. A used car, which has been on the move for more than one year, will not find a document either.

If you can't decide what is the best gasoline, focus on your own feelings. So, if the manufacturer advises to fill in the 95th grade, but in fact it turns out that the transport behaves better on the 92nd, then in this situation it is possible to deviate from the recommendations. Also, do not ignore the resourceful operators of filling stations, because the "unlocking" is more often subject to the brand of fuel, which is more expensive.

If the driver, filling the 92nd, seeks to save money, while knowing that the brand that produced the car is recommended to fill only the 95th, there is something to think about.

What is the best gasoline? Is it worth saving on fuel? The problem is that the higher the octane number, the lower the ignition temperature of gasoline. Due to the predominance of a rather large temperature, over time, the components of the system fail, the operation of which depends precisely on the temperature. Nothing terrible will happen from the fact that you "disobey" the manufacturer several times, but if the use of the 92 instead of the 95 becomes a permanent phenomenon, you should be prepared for considerable expenses on the repair of the power unit. For this reason, if your engine must run on more expensive fuel, then you should give preference to it.

Can different fuels be mixed?

If a driver is trying to save money, he will certainly try to mix the two classes of gasoline. Doing this is absolutely not worth it, since the fuel does not mix with each other. Of course, a duet of different AIs will help to save money, but it will negatively affect the state of the engine, respectively, in the future, considerable funds will have to be invested in the restoration of the unit. Each raw material has a certain level of density, so a more economical option will be at the bottom. fuel tank, in the 95th will go up. First of all, the engine will consume the first, then the second.

What gasoline is better for refueling if AI-92 is recommended in the manual? In this case, the owner can use the 95th grade without fear of damaging the engine. In this way, the traction and functionality of the motor can be improved.

Which gasoline is better than 92 or 95: summary

1. If you cannot determine which gasoline is better for your car brand, use the one specified in the manufacturer's instructions. If both grades are indicated, proceed according to your budget and your own convictions.
2. If you find yourself in a situation where fuel runs out and you are passing a gas station where you can buy a 92nd, refuel only if absolutely necessary!
3. When the engine constantly ran on the 92nd, but such fuel is not sold at the nearest gas station, buy the 95th without fear of harming the unit.
4. If you constantly use the 92nd, but once having tried the 95th, you realized that the car drives much better on it, for example, the dynamics have changed, get advice from the dealer whether it is worth switching to fuel with a high octane number.
5. When deciding which gasoline is best for your car, be careful, because in some cases the 95th, filled instead of the 92nd, can lead to irreversible processes in the engine.

The main difference between 92 and 95 gasoline lies in their method of obtaining. Gasoline is the traditional fuel used to operate road transport... This is the fraction that is obtained by the distillation of oil. Regulatory documents and requirements of standards define several groups of manufactured motor gasoline:

• 80th - "normal".
• 92nd - "regular".
• 95th - "premium".
• 98th - "super".

In the designation of the brand of gasoline, the numbers indicate information about the value of the octane number. This parameter is responsible for the state of fuel stability, which determines the amount of its detonation. This means that the increased octane number of the fuel guarantees increased stability of its molecular structure, and reduces the level of detonation of gasoline. Knock refers to self-ignition when compressed in the engine's combustion chamber, which causes the gasoline to explode in the cylinder.

During a possible detonation of gasoline, the piston group and other engine mechanisms operate under critical loads, leading to rapid wear of parts. Currently, filling stations have a whole range of brands of gasoline, but the most popular and widely used are AI-95, 92 and 98 gasolines. determination of the octane number - a research method.

It is quite possible that if the octane number of the fuel is higher, then its cost for the end user is correspondingly higher.

Manufacturing technology

New technologies are promoting three methods of making fuel for automotive engines:

1. Obtaining a combustible mixture using direct oil refining, the octane number is equal to 50 units. This mixture has increased flammability and is not used in production. It requires adjusting the composition in special industrial laboratories with the requirement to increase the octane number.
2. Catalytic cracking is the most economical and simplest method for re-distilling gasoline to increase the octane number to 80. Catalytic cracking is used in virtually all fuel production plants.
3. Catalytic reforming is a costly from the point of view of economics, requiring high-tech equipment, a way to increase the octane number, but it makes it possible to reach the octane number up to 99. This method is usually used in European countries.

In special laboratories, gasoline, which has a low octane number, is a product of direct oil refining. By adding special additives, the composition of gasoline is adjusted, and the octane number is increased to the required level for the consumer.

Methods and uses of additives

• Fuel mixing... It is a technology method of mixing fuel with a chemical that has increased resistance to ignition. A chemical with a high octane number in excess of 250 units, which is called monomethylaniline, is successfully used here.
• Metal-containing additives... Tetraethyl lead became the main element of such additives. Such an element of additives creates the full return of gasoline of a given power and the greatest work of the engine of your car. The main disadvantage of this fuel is lead deposits on the walls of the combustion chamber. Over time, this negatively affects the respiratory organs of a person.
• Today use tetraethyl lead, as a fuel additive, was banned, and is no longer used even abroad.
• Use of alcohols and ethers... The simplest way to increase the octane number, which is used by many manufacturers of motor gasoline. Main feature this method is mixing low grade fuel with essential substances. At the state level, the content of these alcohol-containing substances is limited to 15%, because a large concentration of additives with esters acts aggressively on rubber parts.

Gasoline AI-92

According to its quality parameters, it belongs to the "regular" type, like a fuel with a high octane number, and is adapted to function in carburetor engines internal combustion... The operation of carburetor motors has a peculiarity in that they operate at a high compression ratio. Gasoline of the AI-92 brand guarantees detonation resistance and stable operation of automobile engines. This fuel is gradually phasing out its activities in European countries, and its production has been stopped.

In our country, AI-92 fuel is the most common brand of gasoline, and it can be produced unleaded and leaded in a composition with additives that prevent detonation.

Gasoline AI-95

According to its parameters, this fuel belongs to the "premium" type, and is of the highest quality. For its manufacture, raw materials are used in the form of gasoline produced by catalytic cracking with the addition of aromatic and isoparaffinic additives, as well as gas fuel. There are sufficient anti-knock additives. The presence of lead in AI-95 has a limit of 0.013 grams per liter.

"Extra" motor gasoline is similar to standard AI-95 gasoline, but it does not have lead substances.

The main difference between 92 and 95 fuels

It is impossible to give one answer at once, which brand of fuel from the considered gasoline works best in engines. In this case, you need to know that the main parameter for assessing the quality of fuel is the value of the volume of substances containing alcohol and added to the main fuel mixture.

The content of substances with alcohol AI-95 gasoline is several units higher than AI-92 gasoline. This difference is very small that the driver will not be able to notice a significant difference in engine operation. Therefore, it is not scary if you pour 92 - AI-95 instead of gasoline. in fuel, the main thing is its quality. With good quality, the motor will not be damaged. Naturally, there is a difference in cost. AI-92 gasoline has always cost less than AI-95 fuel.

Can I mix gasoline 92 and 95

It is impractical to mix these gasolines as they cannot mix completely. Gasoline 92 will settle to the bottom, and 95 will rise to the top, but if the car should run on 92 gasoline, then 95 can be used, this will even increase the engine speed and its throttle response.

For new engines equipped with knock sensors, the replacement of gasoline from 95 to 92 is quite comfortable. When knocking occurs, the sensor signals to the electronic unit about the need to correct the operation of the motor, making the detonation minimum.

Many car owners believe that it is necessary to strictly follow the vehicle manufacturer's recommendations for the use of a particular brand of gasoline. Violation of these requirements often leads to expensive repairs. For example, the manufacturer specifies that the engine should run on 95 gasoline, and the owner of the car fills 92 gasoline, or a mixture of two gasolines. In this case, a problem with the engine will soon appear.

This is because the higher the octane number, the lower the combustion temperature. And when burning gasoline with low octane, the temperature will exceed the norm, some engine parts may burn out.

How true is the judgment that 92 gasoline is better than 95? Can different fuels be mixed? Why are different brands of gasoline indicated in the recommendations of VAZ and Renault-Nissan for the same engine? And what should you pour into the tank to save money?

It's amazing how many questions arise in the head of a Russian motorist when he once again thinks about the rise in fuel prices. Yes, life becomes more expensive, but change to public transport I don't want to at all, so the thought of the possible use of low-octane gasoline comes to us more and more often. So, which gasoline to fill: 92nd or 95th? Content:

To figure out which gasoline is better to fill in a car: 92nd or 95th, you first need to understand what the octane number (RON) is and what it affects. Of course, hardened drivers know this without an educational program, but it will be useful for beginners to read this.

Attention: octane number (also known as detonation resistance) is a parameter that determines the ability of a fuel to withstand the self-ignition process when compressed in the engine combustion chamber. This means that the higher the RON, the later the gasoline is ignited and the more efficient its combustion is.

In turn, any motor is designed for a certain compression ratio. For example, VAZ engines have a compression ratio of 9.0 or 9.9. The instructions for cars equipped with these engines indicate that the recommended brand of gasoline is 92nd. What does this mean? And that in this power unit 92nd gasoline will not be able to self-ignite. It will only light up from a spark when the car is fully ready for it.

If gasoline spontaneously ignites prematurely, this leads to engine overheating, accelerated wear and even some breakdowns. Therefore, manufacturers always indicate which brands of fuel are allowed to refuel a particular car.

Is it possible to fill in 95th or 98th gasoline instead of 92nd?

What kind of gasoline should I put in a grade 92 tank? Experts believe that it is permissible to refuel with anything from 92nd and above.
Everything is logical: if we fill the tank with fuel with a higher octane number, we reduce the likelihood of detonation in the cylinder, and this is an indisputable plus for the engine. In this way, we reduce the risk of breakage.

It is quite expected that on 95th or 98th gasoline the car will go smoother and be able to develop more power, because the fuel in the chamber will burn with greater efficiency. At the same time, the car can normally start to consume a little less fuel. However, one should not expect a significant difference in the behavior of the car and the cost of gasoline. Moreover: if, for example, a car is designed for 92nd gasoline with a compression ratio of up to 10.5, then the use of the 95th grade may lead to some loss of power.

Many motorists are confident that using 95th and 98th gasoline instead of 92nd will lead to cylinder burnout. Perhaps this was the case in older cars, since their engines did not know how to adapt to changes in octane number. Modern cars are supplied with special electronic units designed to adjust the engine operating mode in accordance with the quality of the filled fuel.

BUT: the electronic unit (ECU) has specific ranges of operation, so it is better not to take risks and not "jump" over the brand. That is, if your car runs on 92nd gasoline according to your passport, then you do not need to fill it with "weaving", 95th will be enough.

Is it possible to fill in 92nd gasoline instead of 95th?

What kind of gasoline to fill in the car if the 95th is prescribed in the instructions, but you really want to save money? Alas, only the 95th. You don't want to be denied warranty repair in case of a breakdown?

It is worth refueling the car with a fuel with a lower RH, and it will start to "capricious": to emit clattering sounds, reminiscent of the clatter of valves. This indicates detonation processes occurring inside the engine. Another sign of knocking is when the engine continues to run after you have already turned off the ignition. In this case, there is no good to expect.

To avoid serious damage and expensive repairs, it is advisable to drain low-octane gasoline from the tank as early as possible and refuel the car with fuel that fully complies with the manufacturer's recommendations. If a breakdown does occur, the service center will quickly understand what happened. In this case, you will have to carry out all repair work at your own expense.

If you have an ECU, the negative consequences are minimized, but then you will significantly lose power. Is there any point in such savings ?!

Can 92 and 95 gasoline be mixed?

When choosing which gasoline is better to fill, some are forced to mix two brands at once. For example, refuel the 92nd canister to the remains of the 95th. What comes of this and can you do this?

Some people believe that mixing two "different octane" brands will result in a kind of average type of gasoline. In practice, this is not so effective and it will not be possible to get any practical benefit from such an experiment.

You need to understand that if, when mixing, you use gasoline with a lower octane number than prescribed in the instructions, then you at least risk getting increased engine wear (see the previous section).

Why octane is not everything

In principle, refueling a car is an extremely simple matter: drove into a gas station; paid for the displacement on the required column; waited for the ordered volume of fuel to flow into the tank, and went about his business.

But ... we are in Russia, where the quality of fuel often leaves much to be desired. Even if you know exactly what kind of gasoline you need to fill in your car, you are not insured against buying lower quality fuel. For a long time, it was even believed that 92nd gasoline is much better than 95th. It was believed that the 95th was greatly diluted with us, so it would be cheaper and more correct to refuel with the 92nd. Now the quality of fuel in large cities more or less corresponds to the declared characteristics, although there is still a risk of running into an unscrupulous seller.

Probably, you have come across gas stations where they sell AI-100. Some go around such places by the side, others buy "weaving" at exorbitant prices, because it’s supposedly cool. In reality, as a rule, they pay a lot of money for the most ordinary 98th gasoline, just slightly "overclocked".

And the secret is this. Many do not even realize that the quality of fuel is determined not by one, but by two indicators at once:

1. Research method;
2. OCH according to the motor method.

The first indicator is the same octane number that is displayed in the name of the brand of gasoline. It is determined by testing at low speeds. The second indicator was obtained at increased revs... Despite the fact that it is not indicated in the brand name, it is of great importance.

So: if you ask for information on the very same AI-100, with a high degree of probability it will turn out that the RPM by the motor method does not exceed 88. This means that you are buying ordinary 98th gasoline, but at a bad price. Well, what kind of gasoline is better to fill: AI-100 with motor number 88 or AI-98 with motor number 90? Yes, yes, and the latter is found, you just need to look carefully.

In addition, it is important to properly understand the relationship between octane and vehicle power. Many people think that if they fill their Zhiguli with 98-m gasoline, their “swallow” will fly like an arrow. In fact, the situation is this: a more powerful car requires fuel with a higher octane number, but high-octane gasoline alone will not turn Oka into a Ferrari.

We got acquainted with the positive and negative consequences that arise when refueling a car with non-native gasoline. It is believed that all modern cars require gasoline not lower than AI-95, however, with a compression ratio of up to 10, AI-92 is often recommended.

Manufacturers always indicate in the accompanying documents which gasoline is better to fill in a particular car. Ideally, these guidelines should be followed closely. Manufacturers often indicate not one, but two permissible grades of fuel at once. This means that you can fill your car with any approved brand with equal success. However, if you consider that there is a risk of purchasing low-quality gasoline, it is better to use a fuel with a higher octane number.

What if there is no consensus among manufacturers about the brand of gasoline?

So, in order to understand what kind of gasoline to pour into the tank of your iron horse, you just need to open the documents and find fuel recommendations there. By the way, this information is usually also on the filler flap.

But what if two factories recommend different gasoline for the same engine? You don't have to go far for an example. Our dear Priors, Kalinas and Grants, equipped with a VAZ-21127 engine, on the recommendation of the plant, should run exclusively on 95th gasoline. The same engine, which in Vesta and XRAY carries the VAZ-21129 index, is ready for the 92nd brand. Why is this happening?

It must be said that such inconsistency is characteristic of many alliances. It's just that different engineers have different views of fuel. For example, at VAZ, experts think like this: “95th gasoline is more environmentally friendly. The whole world is switching to more environmentally friendly fuels, so we are definitely on the right track. In addition, if the 92nd is poured into the tank under the guise of the 95th, the car will hardly notice it. It's another matter if in the documentation we write 92nd, and the driver gets 80 instead of it, then it will be bad ... "

Conclusion

It has become normal to use 95th gasoline instead of 92nd today, because in Europe 92nd is a thing of the past, and our country is not far from that. Modern cars all polls require fuel from the 95th grade and above. In extreme cases, the plant indicates a range from 92nd to 95th.

So, which gasoline is better to fill in the tank of your car, you decide on your own. Indeed, in the event of a mistake, all responsibility rests only with you. But it would be more correct to follow the manufacturer's recommendations and refuel only at proven gas stations.