95 or 92 gasoline? These disagreements can be called classic for all car enthusiasts. Today we will answer this question briefly and in understandable language.
Previously in this "competition" the best gasolines“80-octane gasoline also participated, but it gradually left the market because modern engines have a higher compression ratio and because of this they need higher octane fuels.
It is precisely because of the degree of compression that the use of this or that gasoline largely depends. The higher the compression ratio, the higher the octane number of the gasoline used.
I remember how before, in order to use low-octane gasoline (76 or 80), car owners installed an additional cylinder head gasket, thereby reducing the compression ratio.
But time and technology do not stand still; engines are becoming more powerful, economical and less toxic. On sports cars it's not enough for a long time octane number even 98 gasoline. Therefore, chemical fuel additives (additives) are used to increase the octane number.
Which is better - 95 or 92 gasoline?
This question is much simpler than everyone thinks.
I only use 95 gasoline! Why? Because that's what it says in the owner's manual for my car.
I know that many drivers “foaming at the mouth” prove that 95 gasoline does not exist, that it contains additives and the like. So what, what additives are there? Additives are found almost everywhere, including in motor oil, but for some reason this doesn’t scare anyone. Good additives are chemical compositions, which are designed to help the engine. There is absolutely nothing scary about this. I am more than sure that this debate will soon lose its relevance, since, in my opinion, 92nd gasoline will face the fate of 80th gasoline. And this will happen in the near future. Here's a look O rub.
There is also an opinion that 95 gasoline is often counterfeited. Of course they fake it. But 92nd gasoline is also counterfeited. There are quite a lot of unscrupulous people, so they counterfeit everything - from gasoline to cigarettes. Therefore, refuse gasoline from used O I don’t think it’s entirely reasonable to have a higher octane number because someone is counterfeiting something. You just need to refuel your car at proven gas stations.
I hope that many people pay attention to how manufacturers write in the instructions - “95th or higher” or “not lower than 95th”. It follows from this that more is possible, but less is IMPOSSIBLE! And this is not a statement from some Uncle Vasya from the car market, but a recommendation from the manufacturer! Moreover, while the car is under warranty, this is not a recommendation, but a rule that must be followed so as not to lose warranty service!
Another misconception is related to the knock sensor. Inexperienced car owners think that the knock sensor will correct the ignition timing, and detonation from the low-octane gasoline used is not terrible.
It is also worth considering that if the knock sensor reports detonation, then several bursts of this very detonation have already occurred! And only then the ECU changes the parameters! I don’t think there’s any need to explain how dangerous detonation is for an engine. I've seen piston engines killed by constant detonation. This is probably the main enemy of motors.
Plaque on spark plugs from using 95 gasoline
Yes, this fact takes place. But there’s no getting around this for now. Until they use more modern chemical compounds to increase the octane number, this will have to be tolerated. You always have to pay for everything, and this fact is no exception.
It’s better once every seven thousand kilometers than to ruin the engine with detonation. It's my opinion.
Which gasoline consumes less?
I won’t even consider this issue, since I see absolutely no point in it. If the engine is designed for gasoline with an octane rating of at least 95, then using 92 for the sake of some savings of 50 kopecks is simply absurd.
What kind of gasoline do you use? 95 or 92 gasoline
At the time of writing, there is a slight advantage on the side of 95 gasoline.
The choice is yours, of course, but remember that detonation kills the engine.
P.S. I would like to note that there is no need to generalize this advice to all engines. Exactly the engines! Because engine manufacturers and car manufacturers are two different things. The same engine can be used in different models cars. And you need, first of all, to look at the characteristics of the engine, and not at the make of the car! For example, my wife’s car has an engine that is recommended to use unleaded gasoline with an octane rating of at least 91.
And those who want to get to the bottom of the truth and understand why on some cars of the same model gasoline is recommended at least 91, and on others at least 95 - read this short one and draw your conclusions
Take care of yourself and good luck on the roads!!!
How to convert the Lacetti to 92 gasoline or, conversely, to 95? Very simple. Here are photos and video instructions for this simple procedure.
In the world of car enthusiasts, perhaps the most inexhaustible and controversial topic of debate is what gasoline to use? 92nd or 95th?
Even in our community at the time of writing this article, the votes were divided almost equally - 52% for the 95th and 48% for the 92nd.
Moreover, it is practically impossible to convince one half or the other. I expressed my opinion on this matter at
But in fact, the reason for the controversy lies not only in beliefs and religious worship of this or that gasoline.
I would like to consider the other side of the coin. The fact is that very often you can hear from owners of seemingly identical cars completely different impressions of using fuel with different octane numbers. Someone writes that the car does not move at 92, someone hears detonation and other nuances. And someone, on the contrary, hates 95 gasoline - like high consumption, the car stalls, etc.
Why are there such opposite reviews from owners of identical cars? Of course, everything, as usual, can be attributed to the different quality of fuel in different regions and at different gas stations. But let’s leave this for those who blame gasoline for all their problems.
Let's try to figure this out according to Feng Shui
The fact is that despite the identical engines, not all engine control units are configured in the same way.
Let's look at this in more detail.
The first models for the Ukrainian market were equipped with special electronic jumpers under the hood. On the diagrams they received the name, which in translation means - octane switch.
I talked about this jumper in the article. By default it was set to 91 octane from the factory.
But, after some time, this jumper was removed, and by default the ECU began to be set to octane 95. Therefore, even in the operating instructions for the car, Lachevodov has different requirements for the fuel used. Some have no lower than 91, and some have no lower than 95.
These changes are associated with more stringent environmental requirements, which apparently did not allow the use of 91 octane.
From that moment on, the debate over the fuel used intensified, as some rode better on the 92nd, and others on the 95th.
And some are convinced that there is no difference and all these settings do not have any effect, and the knock sensor will help adjust the ECU to any octane number.
What can I say... Everyone has their own opinion and everyone has the right to think the way they want.
But if you don’t think, but look at the real development of events, you will notice that when you switch the jumper to 95, the starting SOP on the diagnostic graphs actually increases. And you can also notice that people have made the knock sensor literally a holy and omnipotent sensor, capable of correcting almost any situation. If you look at the diagnostic graphs, the adjustment of the OZ for cylinders begins only at a speed of 90 km/h...
How to convert Lacetti from 95 to 92
Despite the fact that the octane number switching jumper was eliminated, this option remained in the engine control unit. And using it is not difficult.
Let's consider this procedure on the SIRIUS D4 ECU, but these options are also available on other control units, including the HV-240.
First, let’s determine exactly what kind of gasoline your engine control unit is configured for, if you don’t know. To work, we will need a 10 mm wrench and an ohmmeter (multimeter).
First of all, disconnect the negative terminal from the battery
...and remove the block from the ECU
We need pin 27 of the ECU block. The last contacts are signed and it is not difficult to calculate the required contact. He appears fourth from the right in the bottom row.
We connect the first probe of the multimeter to it. Not all probes reach the contact, so it is convenient to use a piece of wire
We connect the second probe of the multimeter to ground. The most convenient way to do this is by connecting to a disconnected contact from the battery
We set the multimeter to resistance measurement or “continuity” mode and watch the readings. If the resistance is minimal, then the 27th pin of the ECU is connected to ground, and this, in turn, means that the ECU is set to 95 octane.
That's what it looks like in the photo below. 1.3 Ohm is the resistance of the probes themselves
It's clear? I will repeat.
If the 27th contact of the ECU block is shorted to ground, then the ECU understands this as 95 octane. And if the 27th contact is not shorted to ground, then the ECU understands this as 91 octane.
This can be done in two ways:
- Remove pin 27 from the ECU block and leave it unconnected.
- Cut the wire from pin 27. You can leave it cut, or you can make a switch, or a “male-female” switch for quick switching between 91 and 95 octane. Here the choice is yours.
To find the required wire, you need to remove the cap from the ECU connector.
Let's move it forward
We remove the cover and find our fourth wire from the edge from the 27th contact
This is the wire
Attention! I have a car with an octane switching jumper under the hood, so my wire is blue! On cars without this jumper, the wire will be black with a white stripe! This doesn't change the essence!
To switch to 92 gasoline, just cut this wire. And in order to switch to 95 again, you need to connect this wire again.
If you do not want to cut the wire, you can simply remove pin 27 from the ECU block.
To do this, pry off the yellow plastic chip from one end
Then from another
And we extract it.
We see contacts in all their glory. Now we need to use a needle to squeeze the contact we need and pull it out of the block
We put everything back together and our car can run normally on 92nd gasoline.
It is also advisable to reset adaptations using the Chevrolet Explorer program. You can download, configure and learn how to use it in the section
Here is a video on how to convert a Chevrolet Lacetti to 92-gasoline
I’ll add on my own that I prefer driving on 95 gasoline in the Ron switch 95 position.
Well, what should you do and it’s up to you to decide
Peace and smooth roads to everyone!
The F14D3 engine, which is installed on the Chevrolet Lacetti, was developed back in the early 2000s. True, “developed” is a loud word. In practice, this is an Opel engine developed in 1996 X14XE, almost all parts are interchangeable, the ratings and parameters of the crank group are identical, but no one really advertises this. Well, God bless him, we, Lacetti owners, are more concerned about the issue of operating costs - what kind of gasoline to fill up with and whether it is possible to switch from AI 95 to AI 92.
The Lacetti engine is capable of digesting 92 gasoline, but it is better to pour 95.
Regular motor gasoline is what 92nd gasoline is called according to the international European classification.
This means that it is used for medium-load naturally aspirated engines with a medium compression ratio. In Europe, both leaded and unleaded grades of 92-octane gasoline are produced. At the same time, 95 gasoline is classified as Premium motor gasoline . How big is the difference between these two brands? It is enough for General Motors to recommend AI-95 for use in accordance with GOST 51105-97 (leaded gasoline).
The numbers that designate gasoline brands are octane number. Therefore, three units of difference plays a significant role. Moreover, until 2009, GM recommended refueling with gasoline of at least 92. Since that time, the engine has been slightly modernized and fuel requirements have changed. New technologies for the production of petroleum products have also emerged.
Thus, AI-95 is indeed produced from low-grade gasoline, but with the addition of modern additives (aromatic components, gas gasoline, products of high-temperature distillate processing). And this is no longer the 95 that was sold to us 10–15 years ago.
What kind of gasoline to fill in a Chevrolet Lacetti
While the car is under warranty service, it is strictly forbidden to pour gasoline with an octane rating of less than 95 into the tank.
And this is not a whim of GM or a universal conspiracy. If during warranty period If there is a breakdown and as a result of the examination it will be established that detonation occurred in the engine due to the wrong brand of gasoline, the case will be considered non-warranty and the owner of the car will have to pay for repairs. The main reason for the firm’s persistent recommendations is detonation prevention.
Knock sensor and 92 gasoline
Many people think that the knock sensor, which is designed to send a signal about the start of the detonation process to the control unit, will correct the ignition timing.
Yes, it will correct, but within certain limits. The thing is that constant correction of the ignition timing already indicates that there have already been bursts of detonation in the engine; how quickly the sensor will react, how quickly the ECU will react and within what limits, one can only guess.
Meanwhile, the detonation continues. No one needs to explain how it's harmful to the engine , but we saved a couple of rubles on the octane number of gasoline.
Survey
And what in the end: AI-92 or AI-95?
By the way, in Europe there is no 92 gasoline, there is 91. And the difference between it and 95 is even greater.
It remains to make a few important conclusions before choosing one of the pistols at the gas station - with 92 and 95 gasoline:
conclusions
Naturally, everyone can draw conclusions for themselves. However, if we want our Lacetti to cover more than one hundred thousand kilometers, we should adhere to the manufacturer’s recommendations. He won't give bad advice. Don’t skimp on oils and gasoline and have smooth roads for everyone!
Full range of engines Chevrolet Lacetti designed with an optimal ratio of efficiency and liter power. Fuel consumption is comparable to competitive models. At the same time, the car provides sufficient dynamism, allowing the car owner to feel confident both in city traffic and on the highway.
From gasoline being poured into fuel tank stability depends power plant and its durability. Therefore, the quality of fuel must be approached with maximum responsibility and not fill the gas tank with fuel from questionable gas stations.
If gasoline consumption has increased and no external factors have changed, this means that attention should be paid to the car. The consumption rate set by the automaker, although obtained under ideal conditions, is still a guideline for the normal operation of the power plant. A sharp increase in fuel consumption very often indicates that a component or part of the power plant or related systems requires repair.
Fuel consumption with different engine sizes
The fuel consumption of a Chevrolet Lacetti depends on the volume of the power plant, as well as on the gearbox with which the car is equipped. Consumption per 100 km according to the Chevrolet Lacetti passport with 1.4, 1.6, 1.8 liter engines is shown in the table below.
Table - Fuel consumption of Chevrolet Lacetti
Gasoline selection
According to the manufacturer's recommendation, only unleaded gasoline with an octane rating of 95 or higher should be filled into the gas tank. Lower octane fuel causes detonation in power unit and may cause damage to the cylinder-piston group.
The use of low-octane fuel in the power plant causes detonation damage. They are fairly easy to identify. In this case, the car owner risks losing free warranty repair. Therefore, if you want to reduce the cost of refueling, there should be no choice between 92 or 95. More detailed behavior of the car at various types fuels are shown in the table below.
Table - Effect of octane number on driving Chevrolet car Lacetti
Fuel tank volume
The tank volume is designed so that the car can travel up to a thousand kilometers without additional refills. The capacity of the Chevrolet Lacetti gas tank in various bodies is given in more detail in the table below.
Table - Chevrolet Lacetti gas tank volume
Reviews from car owners indicate that actual capacity allows you to fill up to 65-67 liters before the cutoff. This is due both to the “honesty” of the gas station and to the fact that the tank volume is slightly larger than the normalized one.
Description of the reasons for high fuel consumption on Chevrolet Lacetti and their solution
If the engine is worn out, the valve is burnt out or the rings are stuck, the compression in one or more cylinders may be reduced. As a result, the fuel burns less efficiently. This worsens the dynamics of the car and requires an increase in fuel consumption to maintain the desired speed limit. Eliminating the problem is only possible by defecting and replacing damaged components or parts.
Actual fuel consumption may differ from the norm due to insufficient pressure in wheels. The result is increased force required to overcome rolling resistance. To fix the problem, you need to pump up the wheels, monitoring the pressure with a pressure gauge.
Frequent Chevrolet problem The Lacetti is jamming the brakes. For diagnostics, it is necessary to check the temperature of the wheel disks after the trip. A stuck brake heats them up very much. To repair, it is necessary to replace the cause of the jam, and then bleed the brake system.
Fuel consumption may increase due to filling with low-quality fuel. The engine has to burn more fuel to maintain the required dynamics. Very often, counterfeit becomes the reason why fuel filter and mesh. The problem can be solved by draining low-grade fuel and flushing the fuel line.
Effect of maintenance on fuel consumption
Failure to replace consumables in a timely manner or their poor quality is common cause, why fuel consumption has increased. Thus, the fuel filter directly affects the air supply to form the air-fuel mixture. A drop in its throughput worsens specifications power plant and causes high fuel consumption.
Clogged air filter
Spark plug, oil and oil filter also directly affect fuel consumption. They require timely replacement and full compliance with the automaker's recommendations.
Oil filter installation
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