What kind of gasoline is better to fill? Octane number and cost.

A lot of motorists are interested in the question - which gasoline is better to refuel, 92 or 95, and, moreover, it is asked not only by beginners, but also by experienced drivers.

In this article, we will consider what to do in case of refueling with low-quality gasoline, why it is necessary to fill the car with fuel that meets technical standards.

Some motorists are confident and claim that the higher the octane number of gasoline fuel, the better it is, and such fuel is better for the engine. On the one hand, there is some truth in this statement - on high-octane gasoline:

• the motor runs smoother;
• there is practically no detonation;
• dynamics improves, fuel consumption decreases.

To have an idea about gasoline, you should know - gasoline fuel is obtained by distilling oil. The octane number (RON), in simple terms, is the detonation resistance of gasoline, and by direct distillation, a maximum RON of 93 is obtained, a higher octane number is obtained only due to special additives.

High-quality additives really improve the RON of the fuel, but not at all gas stations AI-95 gasoline meets the standards, and it is difficult to say what is sometimes added to it.

You should also know - each engine is designed to work with a certain type of fuel, and if the vehicle's operating characteristics indicate that it should run on 92nd gasoline, another brand of fuel should not be poured, and the question "which is the best to refuel gasoline" is resolved by itself ... Fuel for the car is the best fuel that should be put into the fuel tank, other options should not be considered here. The volume of the combustion chamber in the internal combustion engine is designed for a certain octane number of gasoline; the use of a different brand of fuel can lead to the failure of parts of the power unit.

In theory, the grade of AI-95 fuel should not be used instead of AI-92, but there will be no particular harm from this to the engine. If the difference in octane number is more significant, then there may not be very good consequences for the motor. For example, if you operate an engine designed for AI-80 fuel on 92nd gasoline for a long time, exhaust valves may burn out over time. The use of 95th gasoline instead of 92nd in practice does not lead to undesirable consequences, on the contrary, the internal combustion engine only works cleaner on high-octane fuel, while also:

• dynamics rises;
• fuel consumption is reduced.

Again, one should make a reservation - all this is true only when using high-quality gasoline with normal, "non-slimy" additives.

If the car must run on 95th gasoline, it is highly undesirable to refuel the car with fuel with a lower octane number, here the consequences for the internal combustion engine can be much worse. And the result of refueling the AI-92 instead of the AI-95 is as follows:

• engine detonation appears;
• dynamics disappears, the motor pulls worse;
• fuel consumption increases;
• the engine works hard.

If the use of higher-octane gasoline instead of low-octane gasoline is still somehow allowed, then on the contrary, this should not be done in any way. The 92nd instead of the 95th significantly reduces the resource of the internal combustion engine, and the engine in this case may require major repairs much earlier than the due date. In any case, it is better to pour gasoline of higher octane, there will be less harm to the engine from this.

Use of low-quality fuel

At Russian gas stations, fuel does not always meet quality requirements, and low-quality gasoline is harmful to the car. If you have refueled the car with bad gasoline, it is not difficult to understand this, low-quality fuel is determined by the following criteria:

• the car stopped driving normally, as if someone was holding it from behind;
• fingers rang in the engine - detonation appears when the gas pedal is pressed sharply;
• the engine runs sluggishly.

As a result of the use of poor gasoline in the combustion chambers and on the piston crowns of the internal combustion engine, soot is formed, the engine can smoke strongly with black smoke. What you need to do when refueling a car with bad gasoline:

• drive at low speed to the nearest auto repair shop;
• drain all fuel from the gas tank;
• flush the fuel system;
• change spark plugs and fuel filters;
• diagnose the injectors (carburetor) depending on the type of engine.

No one is insured against refueling with low-quality gasoline, but if you adhere to some rules, you can protect yourself to the maximum from bad fuel. You should refuel your car only at proven gas stations, for example, at Lukoil or Transneft, here in 99 cases out of 100 you will be filled with normal gasoline. Still, one should not be led on a suspiciously low price of fuel, very often the savings come at a cost.

If you refuel your car often, pay attention to the appearance of the gas station. The petrol station should be of a normal type, with the availability of good equipment, with all the necessary information for customers. In general, you should refuel in large settlements, at large gas stations. Petrol stations of unknown type should raise suspicion, and it is better to bypass them.

Gasoline additives

Octane-boosting additives used to be based on the use of tetraethyl lead, in Soviet times, such concepts as leaded and unleaded gasoline were very popular. Nowadays, the use of a dangerous additive that pollutes the atmosphere, including leaded gasoline, is prohibited in many countries, however, cunning entrepreneurs often use tetraethyl lead in pursuit of profit.

Nowadays, it is almost impossible to find leaded gasoline; its use has been banned in Europe since January 1, 2000. Despite the ban, there are dealers who use tetraethyl lead, and, as a rule, their gasoline is suspiciously cheap. A harmful additive not only pollutes the atmosphere, it also negatively affects the operation of the car as a whole. First of all, the catalyst is clogged here, and replacing it is expensive for the car owner.

The octane-increasing additives in modern gasoline are based on ethanol. The substance is regular ethyl alcohol and is no longer as toxic as tetraethyl lead. Modern 95th gasoline is a fuel to which 10% ethanol is added, the fuel is approved for use in all countries, including Europe.

Gasoline AI-98 fuel is mainly used for high-performance engines, which are installed on elite premium cars and sports cars. It is not recommended to fill in such gasoline just like that, especially since the cost of Ai-98 is quite high. But still, in some cases, you should refuel with 98th gasoline, for example, to raise the octane number to normal.

If you fill up with bad gas and the car stops driving normally, the AI-98 will help out - adding 5-10 liters of fuel to the gas tank will allow the engine to “breathe” normally. But if before that you have filled in frankly "burned" fuel, the 98th will not help, and flushing the fuel tank cannot be avoided.

Starting this little research from the premium segment, you can ignore a few traditional exclamations on the topic “Will someone, buying a car for 3-5 million, think about saving gasoline?”. Yes, it will - many buyers value moderate consumption in their car and an adequate cost of the monthly ration. Therefore, recalling the unpretentious representatives of the "premium" is a very urgent task.

However, I managed to remember very few of them - more precisely, only one. Of course, it would be too optimistic to expect from modern engines of the "German troika" or "Japanese two" the possibility of consuming 92 gasoline. But at first glance, less demanding "Americans" like all Cadillac models and the overwhelming majority of Jeep want to see in their tank fuel with an octane rating of at least 91 according to the American standard - that is, the equivalent of the Russian AI-95. Yes, even "mammoths" like the Grand Cherokee, Escalade and Tahoe suggest a 95 in their huge tanks. The only exception is the Jeep Wrangler, which is ready to run on unleaded gasoline with a RON 91 minimum.

Middle segment

In the middle segment of cars that allow you to save on gasoline by a couple of rubles per liter, of course, there are more - here the class already allows you to have this characteristic among the competitive advantages. Nevertheless, no one particularly emphasizes the ability of cars to digest 92nd gasoline - as a rule, you can find data on the type of fuel only in the operating instructions.

Under the hood of the Ford Kuga "2016 – present.

For example, Ford has such data. The manuals of Fiesta, Kuga, EcoSport, Explorer and others clearly state: use unleaded gasoline with an octane rating of at least 92. In the Mondeo manual available on the website, however, the American standard AKI with an octane rating of 87 is indicated - but it also corresponds exactly to “our "AI-92.

In the photo: Ford Fiesta "2017

At Honda, unlike many others, the type of fuel used is spelled out directly on the website, among other technical characteristics. It seems that the fact that this fuel is AI-92 contributed to this in part. Gasoline of the "Regular" class is recommended for both Pilot and CR-V with both 2 and 2.4 liter engines.

Photo: Honda Pilot "2015 – present and Honda CR-V" 2016 – present.

Another Japanese manufacturer, Mitsubishi, also has "omnivorous" cars in its arsenal - albeit only two. This is an age-related, but such and much more recent Outlander: they have the mark “AI-92” in the “Fuel Type” column, while the new Pajero Sport is no longer satisfied with this gasoline.

In the photo: Mitsubishi Pajero "2006 – present.

Nissan has a similar situation: here only in the description of the budget Almera it is clearly stated that you need to fill in unleaded gasoline with an octane rating of 92. All other gasoline models modestly indicate "gasoline" as the fuel type, moreover, there are no operating manuals on the site, as well as clear guidelines in brochures. A long search leads us to what logically follows from this unknown: all other Nissan models prefer 95th gasoline.

Under the hood Nissan Almera "2012 – present.

The situation with Toyota is even more interesting. Here, the recommended fuel type differs not only between models, but even within the same model equipped with several motors. So, Corolla with base engines of 1.4 and 1.6 liters can only be refueled with gasoline with an octane rating of 95 and higher, but the older 1.8-liter engine can also digest an octane rating of 91. This looks doubly interesting against the background of that that the compression ratio in engines 1.6 and 1.8 is almost the same - 10.2 and 10, respectively. But for Camry the situation is the opposite: the younger engines of 2 and 2.5 liters digest 92nd gasoline, while the V-shaped "six" requires 95th. The same situation with the Land Cruiser Prado: the 2.7-liter unit "eats" the 92nd, and the four-liter engine is the 95th. And off-road vehicles represented by the RAV 4 and Highlander, led by the Land Cruiser 200, can consume "cheap" fuel in all petrol versions. Concluding the conversation about Toyota, it is worth noting that it also saves money not only thanks to the hybrid transmission, but also due to the price of fuel.

It is not easy to find information on the recommended type of fuel from Hyundai. The operating manuals are not presented for all models, but even those that are, sometimes do not contain the necessary data. So, there is no information on the required fuel for Creta in the manual - but there is data, for example, for Elantra and i 30. Recommendations differ depending on the country of operation: in Europe, you need to refuel with 95, and outside Europe, to achieve optimal performance, it is enough to use unleaded gasoline with an octane number RON (research method) 91 / anti-knock index AKI 87 - in other words, our 92nd.

Compatriots from Kia are a little more open about what to "feed" their cars: for the Rio, the official website exhaustively lists "unleaded gasoline with an octane rating of at least 92". For other models like cee’d, Optima, Sportage, Venga, and so on, you need to get to the owner's manual to see the same data as Hyundai.

In the photo: Kia Rio "2016 – present.

Budget segment

We say "budget segment" - we mean "Lada": the domestic manufacturer is confidently leading in terms of sales. He is equally confident in specifying fuel requirements in the technical characteristics of his vehicles. The only "disappointment", perhaps, is that the most budgetary models do not use the most budgetary gasoline: Granta and Kalina, and at the same time 4x 4, need at least 95th. But with Vesta and Xray, the situation is the opposite: both new products from the Volga Automobile Plant are happy to accept the "cheap diet". The situation with Largus is twofold: with an eight-valve engine with 87 hp. he is content with AI-92, but a more powerful sixteen-valve unit with 102 hp. already requires AI-95. It is also curious that on Granta the same 87-horsepower engine, as we remember, consumes 95th gasoline, while in Largus it is reconfigured to 92nd.

In the photo: Lada XRAY "2015 – present.

Another budget carmaker that is keen on reducing the cost of ownership of its products is Ravon. There are no reservations at all here: any of the Uzbek cars of overseas origin from R2 to Gentra is ready to eat AI-92 all its life and not show any signs of dissatisfaction.

There are "exceptions to the rule 95" and some Chinese manufacturers - for example, Lifan. So, the new Solano companions run on 95th gasoline, but the far from new Smily, together with Cebrium, is quite satisfied with the 92nd.

In the photo: Lifan 720 "2013 – present.

Well, the logical "final chord" of the list is the products of the Ulyanovsk Automobile Plant. It would be very strange to see 95th gasoline in the requirements for the content of the "veteran" Hunter - and, of course, it is not there. It is also absent in the specifications for the rest of the SUVs: all UAZ gasoline products work successfully on the AI-92.

In the photo: UAZ Patriot "2016 – present.

Summing up

Taking a look at the list, it is easy to conclude that new cars capable of digesting 92nd gasoline are by no means the majority on the market. Nevertheless, there are also plenty to choose from: if you drive a lot and are careful about the choice of fuel, perhaps we made the task of finding a new car a little easier for you. In addition, it is worth remembering that forums dedicated to absolutely any brand are abundantly dotted with topics like "92 or 95", "Liu 92 and everything is fine", "Liu 92, I regularly change candles / catalysts / pistons and I'm fine" and so on. ... Hot discussions that "there is no 95th in Russia - it's all 92nd with additives!" do not subside for a second, and therefore the final choice of the liquid poured into the tank, as always, remains with the owner.

Only the one recommended by the manufacturer of your car. Its type is indicated in the booklet attached to the car, as well as on the back of the fuel filler flap. Experiments are not needed here: after all, each engine is calibrated for a certain grade of gasoline. And microprocessors and other electronic gizmos are far from omnipotent: they won't force a Premium engine to digest the low-octane Normal.

What happens then? With sharp accelerations and heavy loads, the knock sensor (who has it) will constantly work out, and this leads to unstable engine operation - the car jerks and loses in dynamics. And if there is no knock sensor, then there may be problems with engine overheating and its premature wear, or even burnout of the cylinder block gasket, destruction of pistons and valves. In addition, fuel consumption will increase slightly.

Finally, the strongest argument is the guarantee! If you really started pouring the hell into the tank, and then came with complaints, then at the warranty service, if a disputable situation arises, they will take a sample of gasoline from the tank, after which, with a clear conscience, they will offer you a paid repair. And they will be right.

As a temporary measure, it is possible to allow the use of the 92nd instead of the 95th - if there is no other at the gas station, but you have to go. But frolic at the same time is not worth it. However, everything goes to the fact that the 92nd will not be soon. And the talk that the 95th is always worse than the 92nd, I got fed up.

Should I use Ultimate gasoline if I have regular gasoline?

I am convinced that it is worth it. I only fill my car with Ultimate and other Ectos. But not at all because someone's stupid ad promised ten percent fuel economy - in practice this cannot be. It's just that gasolines with such prefixes in the name have an increased washing ability and constantly remove all rubbish from the fuel system. We have repeatedly verified this in examinations - yes, it works! Therefore, if you take a dirty engine and start "washing" it with such fuel, then after a while it will really add power and become more economical. But in no way better than the same motor, which was already clean.

Should I use 98th gasoline to make the car fly?

Even if you forget about the difference in price, it is still not worth it. Super gasolines have their own specific field of application - they are highly accelerated, supercharged engines that require high knock resistance of the fuel. And there is simply no need to pour such gasoline into a regular, ordinary engine. Moreover, with normal, standard adjustments, the flow rate on the 98th will be higher, and in power it is most often possible to lose. The fact is that the technology of obtaining 98th is often based on the use of a sufficiently large addition of high-octane components with a low calorific value, which means that the total "calorific value" of the fuel will decrease.

Is it possible to calculate the lack of quality by the appearance of gasoline?

Not always. Normal factory gasoline, without excessive content of bad octane-enhancing additives, is either practically colorless, or has a slightly pronounced yellowish or bluish color. But gasolines with a reddish tint should immediately alert. This color is given by metal-containing additives based on ferrocene or manganese. In addition, the excessive content of octane-enhancing additives based on monomethylaniline (MMA) in gasoline gives out a rich yellow color of gasoline and a pungent sickening odor, from which the head then pops.

Do we sell imported gasolines?

Complex issue. These things are usually not advertised. According to my information, Norwegian StatOil gasoline and Neste 98 are imported to the Northwest. But in any case, you need to understand that the machine will not become faster or more economical from them. The more gasoline is "geared" to the environment, the less attention is paid to efficiency - the combination does not work.

Why is it necessary to separate gasoline by European standards and by class?

There is no gasoline in Russia according to Eurospecification standards, and there never was. The inscriptions "Euro" at individual gas stations are PR. The seller wants to call his product a big name - and he calls it names. At least "Euro-7", at least "Pupkin's Gasoline". Unfortunately, this is his right. But in fact, in the Russian Federation, fuels are divided only by class. These norms are similar to European ones, and yet they are slightly different. A detailed comparison of the two documents was in ZR, 2013, no. 6.

The description of the vehicle requires fuel according to EN 228. Where can I get it?

There is no answer to this question. From a formal point of view, "Mazdovody", "Volvolyuby", "Shkodniki" and "Fordowedy" constantly violate the rules of operation of their cars, pouring fuel that formally does not correspond to this EN 228. It remains to be hoped that our classes are not worse than their "Euro". We constantly write about the reasons why a Russian cannot behave like a European. In fact, the officials completely destroyed the fuel quality control system.

What if the environmental classes of the vehicle and fuel are different?

You cannot spoil porridge with oil: the use of fuel of a higher class than specified in the TCP is absolutely safe. But the reverse replacement is permissible only as a forced measure. True, Nissan experts believe that there will be no harm from several gas stations, but colleagues from the Dmitrovsky test site are shaking their heads: they say, there is no need to play these games. VAZ employees say that gasoline from the 3rd to the 5th grade can be poured into their cars.

Unfortunately, at many gas stations the class is not indicated at all. Nothing is written on the column, and not everyone wants to rummage through the papers. And trust in these pieces of paper, in general, is zero. For complacency, you can look at the paid check - is there something like "Class-4"? Well, for complete reassurance, I will quote a well-known St. Petersburg professor: “The motor quickly and confidently kills not someone else's ecological class, but its composition. By the way, this is what distinguishes high-quality gasoline from a bogeyman, which is easy to end up with. "

The simplest advice is this: refuel exclusively at branded gas stations - BP, Shell, Gazpromneft, Tatneft, Rosneft, Neste, Lukoil, etc. Bright signs, shops and other attributes of civilization. It happens, of course, that at the same Lukoil it suddenly turns out that this is not Lukoil, but it is not clear who, since the check is issued by some LLC or OJSC, but in general these are exceptions. Beware of gas stations painted "for the company" and called almost the same - roughly speaking, not BP, but RV, or Likoil, not Lukoil. Never fill in junk, the cost of which is several rubles lower than at a nearby branded gas station. Once we bought such fuel for examination - the car stank through and through, and instead of the 95th, the disgusting 80th appeared in the canister ...

Many questions are often asked about what kind of fuel should be put into cars.
As a rule, there is a sticker on the inside of the cap that covers the fuel filler cap, which, in addition to the standard strict inscription Unleaded fuel only! (only unleaded gasoline!), also says that you need to use Standard or Regular (depending on the country of sale) for conventional naturally aspirated engines and only Premium or Super for turbocharged models. The same inscriptions are found in the operating manuals supplied with vehicles.
But such terms in different countries mean different octane numbers of gasoline, while even the method for determining the octane numbers of gasoline fuels is different in different countries. There are two main methods for determining the octane number (RON) of gasoline: research (RON or RON) and motor (MON or MOR). However, for example, in the USA, the octane number is used, defined as the arithmetic mean between the RON according to the motor method and according to the research method. And in Russia - A-76 is standardized according to the motor method (the research grade is not standardized for it), and high-octane grades (AI-95 and AI-98) - according to the research method! Thus, if, for example, you take the OCH using the motor method of the same 92nd and 95th, then you will get the number 85 in both cases (according to GOST 2084-77).
An even more confusing situation with verbal notation:
In the USA, for example, standard Regular gasoline has an octane rating of 87 (i.e., AI-90 in terms of Russian GOST), and Premium or Super - 92 or 93 (that is, not lower than Russian 98 in terms of octane rating). Moreover, the octane number in America is not written at all gas stations. There are also higher-octane Super gasolines - 94 and higher, but they are much less common.
In England, even standard gasoline (Standard or Premium) has an octane number of 95 RON (analogous to our AI-95 - there the octane number is also determined by the research method). And Super in the same Great Britain has an indicator of 98 RON (that is, close to our AI-98).
In Japan, standard gasoline Regular is not less than 89 RON (on average - 90.3 RON / 81.4 MON), and Premium or Super - not less than 96 RON (on average - 99.8 RON / 88.1 MON), that is Super petrol in Japan has an octane rating of 100!
According to the Japanese manual, for non-turbocharged engines it is recommended to use standard Regular gasoline, that is, an analogue of our AI-92, but for turbocharged models, only Premium is recommended (that is, closer to AI-98!).

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There is another interesting observation. If a car for the Japanese market is designed for Regular gasoline (in our opinion, AI-92), then a similar car for the European market (or purchased from us through a dealer) is already designed for AI-95. For example, Nissan X-Trail or Nissan Bluebird Sylphi (Almera, Sunny). Another fact: the Honda Odyssey for the Japanese market is equipped with an F23A engine, which has a compression ratio of 9: 1, and a similar car for the Singapore market (which focuses on European standards) is equipped with an F23Z4 engine with a compression ratio of 9.3: 1. The higher compression ratio of the Singaporean indicates the use of higher octane gasoline.

Disputes about which gasoline to drive is more profitable, more comfortable and safer, has been going on among motorists for several years. This topic provides a wide field for experimentation, and each car owner considers it his duty to compare which gasoline is better - 92 or 95. In fact, there is no single answer to this question, each type of fuel has its own advantages and disadvantages.

Car designers take into account the characteristics of the fuel and specially adapt the engines for a particular brand of gasoline. For what? It's simple: none of the car brands wants customers to return the product to him before the expiration of the warranty period, just because the engine has failed. And it will certainly "crumble" if you use a brand of fuel for which the car is not adapted. It is for this reason that the manuals clearly state which fuel is suitable for a particular car. The manufacturer can indicate the type of fuel with a certain octane number, or it can report that gasoline is suitable for the car, for example, from 92nd and above.

Such marking does not bring clarity to the situation, because it turns out that you can refuel the car with 92nd fuel, and 95th and even 98th.

Even from the point of view of financial savings, not everything is as straightforward as it seems at first glance. The benefits of using cheaper fuel are offset by higher consumption.

There is still no specific answer to the question of which gasoline is better than 92 or 95. To determine this in each case really has to be empirically, observing how the car behaves after refueling. And - to draw conclusions on the subject of what is better to pour into the tank. But still, it should be understood that there are fundamental differences between these two types of fuel, which lie in the chemical composition of gasoline. They are minor but can cause serious damage.

What does the octane number affect?

The basis of gasoline, regardless of its labeling, is the saturated hydrocarbon isooctane, which is responsible for the combustion of fuel. The use of this substance in its pure form for refueling cars is an expensive pleasure: the process of gasoline production will rise in price several times due to its additional purification.

Today, fuel is supplied to the market, the percentage of isooctane in which can vary. Based on this ratio, the fuel is marked with numbers that indicate the percentage of this substance in the liquid.

This indicator is called the octane number, and the higher it is, the better the fuel is considered.

After all, if it, for example, consists of 92% isooctane, then the remaining 8% are various impurities. The most dangerous of these are paraffins, which, when burned in the engine, form a characteristic soot deposit. It is he who is the reason for the failure of this important automotive unit.

Lower octane fuels have a number of disadvantages, including:

• incomplete combustion in the engine, due to which its power decreases;
• formation of plaque from combustion products, which clog the nozzles;
• higher consumption compared to 95 gasoline;
• higher likelihood of detonation and vehicle fire.

RON 95 fuels also have their drawbacks. Of course, after refueling, your car will resemble a frisky mustang, and you will have to clean the engine from carbon deposits much less often.

But this will not completely eliminate the problems, and the most common of them are:

• operation of the engine in a forced mode, which leads to its premature wear;
• increased fuel costs: the higher the octane number, the more expensive gasoline is.

Experimental results: what to expect from a car after refueling

Everyone decides for himself which gasoline to use, and the arguments of opponents in this case seem very convincing. The owner of a brand new Mitsubishi Lancer, purchased for a fairly large sum, is unlikely to save on fuel and refuel the car with 92nd gasoline, although this is quite acceptable according to the manual. The owner of the old Zhiguli will fill the tank with 95 grade fuel only if he does not find anything else at the filling station. For him, such a step is a luxury that does not justify itself at all.

Based on the numerous testimonies of eyewitnesses who conscientiously experimented on their machines, certain conclusions can be drawn. They will surely help car owners decide on the brand of gasoline. In general, they look like this:

• Gasoline with a higher octane rating reduces the likelihood of knocking and does not pollute the engine as much;
• the difference in cost between fuel 92 and 95 is hardly noticeable, given that higher octane fuel has a lower consumption. Roughly speaking, 12 liters of gasoline of the 92 brand and 10 liters of the 95 brand are consumed per 100 km. The difference in cost for 1 liter is from 3 to 5 rubles;
• you should not count on a car fueled with 95 grade fuel to go faster. The engine will work more dynamically, the acceleration time will be shorter, but you still won't be able to turn the Zaporozhets into a sports car;
• if the car is not designed for fuel grade 95, then during intensive operation its engine fails and completely needs to be replaced after about a year;
• the car, which, according to the manual, needs to be refueled with 95th fuel, after using gasoline of grade 92, needs a preventive inspection and flushing of the engine. Otherwise, it can stall at the most inopportune moment.

If you took the car from the passenger compartment and it is still under warranty, then you should not complicate your life and try to change the fuel in order to have dubious benefits.

The best way out of the situation is to use the gasoline that the manual instructs to pour into the tank.

If you ignore this recommendation, then you can not count on the warranty service of the machine. Any experienced specialist at the service station can easily determine that burnt out valves or melted injectors are the result of your desire to "feed" the car with better fuel. Well, a layer of soot on the parts of the "engine" indicates attempts to save and use cheaper fuel.

After visiting the service station, you will see for yourself: it's not worth it. After all, repairs, maintenance or cleaning of the engine will cost many times more than the modest amount that you will help out on the difference in the cost of fuel.

If you really want to experiment with gasoline, then it is best to do this on a car with a service life of 5 years or more. All components and assemblies in such a car have long been "used", so you can easily feel the difference in the behavior of the car and personally determine for yourself whether it is worth neglecting the recommendations in the manual. The first trip is best done in the urban cycle, which will reveal all the advantages and disadvantages of fuel. This will be the most honest and objective experiment that will track the behavior of the car in various situations. And in case of problems in the city, you can get to the nearest service station much faster than outside the city. It is worth driving on the track only if you are completely satisfied with the results of the fuel change.

When using a lower octane gasoline for the first time, it is worth bringing a can of 95 grade fuel with you.

Some non-fuel 92 cars can give you a fight. It’s good if the car simply doesn’t start, and at this point the experiment can be considered complete. It is much worse if you drive a dozen kilometers, after which the engine, having “gorged” on soot, will simply stall. The easiest way out of this situation is to drain the remaining fuel and refuel the car with the usual 95th gasoline. This tactic does not always work, but if you are lucky, you can flush the "Engine" with cleaner fuel and safely get home. Otherwise, you will have to call a tow truck and take the car to a service station, where the engine will be cleaned using special equipment.

What else you need to know about fuel

Often, motorists are faced with a situation where the fuel at gas stations with the same octane number is significantly different. This is felt in the operation of the engine, which may vibrate, make atypical sounds, or "slip". can vary, and this is due to the very impurities that it contains.

The most harmful of these are paraffins, and the more of them in the fuel, the worse the car will feel.

This can only be verified empirically, since at no gas station will they show you the documents that describe the composition of the fuel. Therefore, all that remains in such a situation is by trial and error to find exactly the gas station network, to which your car reacts best to fuel.

Each car will have its own favorites, so do not rely on the advice of experienced drivers who recommend this or that gas station. You must find your "own" operator yourself and subsequently try to refuel the car only with him. Just in case, you need to have several alternative options, not always and not everywhere you will be able to find the gasoline that your car likes best.