Which gasoline to choose AI92 or AI95? This question worries every car owner. If we talk about AVTOVAZ’s new product, the Lada Vesta, it is worth noting that the manufacturer recommends using AI95 gasoline. To save money, many people start using cheaper AI92 fuel. And some, on the contrary, spare no expense and fill the tank with AI98 or AI 98G-drive..
In the operating manual Lada Vesta manufacturer
indicated that only unleaded gasoline “Premium Euro-95 GOST R 51866” or “AI-95-K5 GOST 32513-20013” is allowed for use. If necessary, it is allowed to use gasoline with an octane number of at least 92.
What kind of gasoline should I fill in the Lada Vesta?
During its short presence on Russian roads, Lada Vesta managed to give its owners a lot of recommendations for its operation, which do not always coincide with AvtoVAZ’s instructions and even differ depending on the circumstances. Let's consider the relevance of following the recommendations of the Lada manufacturer regarding the brands of fuel used.
Recommendations
From this we can conclude that:
- It is necessary to fill the Lada Vesta with gasoline recommended by the manufacturer;
- You must refuel at proven gas stations;
- As a last resort, you can refuel with 92, but in this case you should fill in the appropriate additives.
You should not experiment and use other types of petroleum products. The savings will backfire; Vesta’s engine will have to be overhauled. Use the 92 only in extreme cases and drive in a gentle manner.
Which gasoline is better for Lada Vesta: theory and practice
Today the Lada Vesta sedan can be found with four types of engines:
| Engine brand | Volume | Power | Number of valves | Compression ratio |
| VAZ-11189 | 1.6 l | 86 hp | 8 | 10,3 |
| VAZ-21129 | 1.6 l | 106 hp | 16 | 10,45 |
| VAZ-21176 | 1.8 l | 122 hp | 16 | 10,5 |
| HR16DE-H4M | 1.6 l | 114 hp | 16 | 9,5 (after modification by AvtoVAZ) |
The brand of fuel used is “tied” to the “compression ratio” of the internal combustion engine; for clarity, we tabulate the approximate dependence of these characteristics:
| Compression ratio | Fuel |
| 9–10,5 | AI-92 |
| 10–12,5 | AI-95 |
| 12–14,5 | AI-98 |
The brief instruction manual for the Lada Vesta says what every car manufacturer says.
At the same time, in the Lada Vesta operating book, the manufacturer allows the use of gasoline with an octane number of 92, but the use of AI-95 is recommended.
Based on the values of the compression ratio of VAZ engines, this resolution should be rephrased as follows: in normal mode, AI-95 should be used, in gentle mode, AI-92.
AvtoVAZ made changes to the Nissan HR16DE-H4M engine, and its compression ratio was reduced from 10.7 to 9.5.
Let's consider the influence of the octane number of gasoline on engine operation, including the Lada Vesta, and the real factors influencing the ability to comply with the manufacturer's recommendations.
Theoretically, the use of AI-95 adds dynamism to the car (relative to the use of AI-92) and reduces fuel consumption, but the other side of the coin is the higher price of this fuel. And vice versa, the consumption of AI-92 is higher, a car running on this fuel is less playful, but the cost of gasoline is lower.
In fact, the situation is not always like this. The consumption of these two types of fuel in one car depends, in addition to the octane number, on other factors, for example, the quality of the fuel and the individual driving style of the car owner.
Tests "Behind the wheel"
Experts from the magazine “Behind the Wheel” took two editorial Vestas. A sedan with a 1.6‑liter engine and AMT, as well as a SW Cross station wagon with a 1.8‑liter engine and manual transmission. Lukoil Ecto gasoline of different grades was poured into each car in turn: first AI-92, then AI-95, and for dessert - the elite AI-100. The races were carried out at the same time in similar weather. To minimize measurement error, the canisters were filled at the same dispenser (from the corresponding pistols, of course) at the same gas station. Test results:
What kind of gasoline do you recommend for filling the Vesta? Is there a difference when using gasoline with different octane ratings? Take part in the survey and leave your comments. Let us remind you that in another article we determine the real fuel consumption of AVTOVAZ’s new product.
Keywords: power system Lada Vesta | Lada Vesta engine
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Fuel quality
A preliminary assessment of the quality of gasoline can be given visually - by its color. High-quality AI-95 and AI-95 are almost transparent with a slight yellow or blue tint.
Absolutely transparent, colorless fuel is straight-run gasoline, unsuitable for engines. Fuel with a red tint contains metal-containing additives (manganese, ferrocene), while rich yellow fuel contains monomethylaniline.
If gasoline does not visually cause suspicion, you can refuel.
AI-92 is not for LADA Vesta: The compression ratio and the quality of gasoline spoil the engine, according to the Internet
VAZ units “don’t like” when people skimp on them.
Photo: Gasoline for LADA Vesta AI-95 and AI-92, source: Rengum
LADA Vesta owners with VAZ engines often fill up AI-92 in order to save money. the mismatch in compression ratios and the questionable quality of gasoline, which shorten the engine’s life, are not taken into account.
.
Compression ratio and detonation
The choice between AI-92 and AI-95 puzzled many newsmakers. AvtoVAZ itself allows the 92nd, and recommends the 95th. At the same time, the difference in price between gasoline brands is about 3 rubles per liter.
The owner of a LADA Vesta with a 1.6-liter VAZ engine calculated on his YouTube channel that it costs 150 rubles less to fill a full tank with 92-liter gasoline than with 95-liter gasoline. The “behavior” of the car does not change, but the AI-95 saves 0.3-0.4 liters per 100 km and has a longer range. At the same time, taking into account the cost of 1 liter of fuel, consumption and power reserve, 92nd gasoline turns out to be 30 rubles per tank more profitable than 95th
.
However, 30 rubles is not such a pronounced benefit, a motorist who wants to extend the life of the engine
.
He explains the final transition to 95 gasoline by compression ratios
.
On this topic:
New LADA Vesta FL 2021-2022: What is known about restyling today
LED optics, a tablet a la Tesla in the cabin and a more powerful engine - these are the innovations the updated Vesta will boast.
The platform and overall design have not changed, but a lot of cosmetic ones have appeared... The 1.6-liter engine on the Vesta provides a compression ratio of 10.45 atm, while the AI-92 is designed for a compression of 10.5 atm. At the same time, the engine works “at the limit”, the fuel does not burn completely, the cylinders overheat. This accelerates wear and increases the risk of detonation. The lower the octane number of the fuel, the more prone it is to detonation in modern engines, which increases the load on connecting rods and pistons.
Low fuel quality
Finding quality gasoline at gas stations is difficult. 92nd in properties may turn out to be “90th”, which will increase the load on the engine and the risk of detonation
. The ECU will slightly adjust the operation of the engine, in particular, the ignition of the mixture, but the car will lose traction. You will have to step on the gas more actively, which will lead to excessive consumption of fuel. In this case, it will not be possible to completely remove the load from the unit.
Photo: Filling LADA Vesta with fuel, sources: Angi and Drive2
In a 1.8-liter engine with a lower compression ratio than 1.6 liters, 92-octane gasoline burns worse, but there is no severe overheating, and therefore the risk of detonation is lower. However, the car's dynamics suffer.
Using AI-95 gasoline will help preserve the life of the LADA Vesta engine by delaying overhauls.
. Despite the fact that this fuel is more expensive, the risk of detonation is reduced, overheating and overconsumption are prevented, and the harm from possible refueling with low-quality gasoline is reduced - when refueling with 95, it is better to get “93” than to fill with 92, but get “90” y".
Fuel quality ranges
High-quality fuel with the same octane number from two gas stations may have different effects on the engine. This does not mean that the fuel is bad; the reasons for the difference may be the following:
- GOST requires that the octane number of gasoline, for example, AI-92, be “not less than 92,” and the fuel at one station may have this value of 92.7, at the second - 92.1.
- According to the same requirements, the tar content in gasoline should be “no more than 10.0 mg/100 cm3”, and the proportion of sulfur “no more than 0.1%”, and these indicators can also fit within the norm, but vary in value.
An experienced driver will feel the difference in the quality of gasoline and decide to abandon the AI-95 recommended by the manufacturer. This erroneous decision is supported by the presence of a knock sensor in the internal combustion engine, which, when switching to low-octane fuel, will automatically shift the ignition timing.
The sensor reacts to detonation that has already occurred, rather than preventing it.
In addition, after the knock sensor is triggered, the fuel will burn out in the exhaust manifold or, which is really bad, in the catalyst. That is, in such cases, the engine does not adapt to the fuel, but loses power, dynamics and efficiency, and the sensitivity of the gas pedal decreases.
All this speaks to the extreme inexpediency of long-term use of AI-92 gasoline in VAZ engines instead of the recommended AI-95, only in emergency cases.
What happens if you fill with the wrong brand of gasoline?
We have sorted out the question of what kind of gasoline Vesta runs on. Now let's try to understand what will happen to a car engine if you fill it with gasoline that does not meet the manufacturer's recommendations.
If you refuel with gasoline with a lower octane number (for example, 92 instead of 95), then it is important to try to drive very carefully without unnecessary gas changes, otherwise the gasoline may create additional detonation, and unburned fuel will burn out in the catalyst.
If you fill in with fuel with a higher octane rating (for example, 98 instead of 92), this can lead to overheating of the engine, since such fuel burns longer and is not designed for engines with a lower compression ratio.
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In any case, when refueling with the wrong fuel, the problem can be partially solved by diluting it with gasoline with a higher octane number. When refueling AI-80 or DT in vehicles not intended for this fuel, it is necessary to flush the fuel tank.
Realities
In practice, circumstances can be very different. In large cities, control over the quality of fuel sold is carried out more effectively than in the outback. At gas stations with difficult-to-remember names, AI-92 gasoline may be preferable to AI-95, which can be obtained by adding cheap, low-quality additives to cheap gasoline. In such cases, you just have to rely on your driving sensations and the condition of the spark plugs, soot on which, especially red in color, will indicate the presence of harmful substances in the fuel.
Transmission oil
The service book states that after a mileage of 180 thousand km the oil in robotic and manual transmissions needs to be changed, but the experience of Vesta owners suggests that the oil in them should be updated much more often - for every 60 thousand km.
You will need 3 liters of oil of quality class GL-5/GL-4 (according to API) with a viscosity of 75W-80. It’s the same with the variator: although the instructions don’t provide for changing the oil at all, you can extend the service life of the transmission if you change the fluid every 60 thousand. How much liquid is required will be determined by the method by which the change is made, but it is better to stock up on a couple of 4-liter canisters.
Is AI-98 necessary?
Commercial gasoline AI-98 is a fuel obtained by adding to the base of all gasolines - high-octane gasoline, reforming a significant amount of high-quality octane-increasing additives (16%), promoting complete and more uniform combustion of the fuel. The use of high-quality AI-98 in Lada Vesta will not cause any harm to the engine of any Lada model; rather, on the contrary, it will ensure smooth operation of the power unit, an increase in power of 5-10% and even a slight increase in efficiency.
Antifreeze
Red antifreeze G12 from Sintec is poured onto the conveyor. In case of repair or leakage, it is necessary to top up with a similar one. You can purchase antifreeze from another manufacturer, but with the G12 specification. The system has a capacity of 7 liters, however, even if all the pipes were removed, 5 liters of antifreeze is enough. For preventive purposes, it is necessary to update antifreeze at least every 90 thousand kilometers.
