This year, as oil prices rose and rose, once breaking through the "9 yuan era", some overwhelmed car owners asked: "I used to add 95, want to save some oil money plus 92 line?" ”
There are also owners who are not bad money to wonder: "My car has always added 92, but I heard that adding No. 95 gasoline is better for the car, performance and stability?" So can you change it? ”
Below, let's take a look at the difference between No. 95 oil and No. 92 oil.
01
The higher the label, the better the quality?
A higher label does not mean that the gasoline quality is better, regardless of the 92 and 95 gasoline, the main difference between them is the purity of isooctane.
● No. 95 gasoline: it is composed of 95% isooctane and 5% n-heptane;
● No. 92 gasoline: It is composed of 92% isooctane and 8% n-heptane.
Such a difference is reflected in the explosion resistance of gasoline, the higher the isooctane content, the better the explosion resistance, but it is only suitable for different types of engines, and has nothing to do with the quality of gasoline.
Just like mineral water and pure water, you can say that the trace elements in them are different, but you can't say which one is purer and better to drink.
02
Experiments have proved that the label has nothing to do with quality
There are authoritative testing institutions that have specially done no. 92 and No. 95 gasoline quality experiments, and the experimental results show that in the case of the same amount of gasoline 92 and 95, the quality of the sediment finally produced by the two types of gasoline is not significantly different. That is to say, the label of gasoline has nothing to do with the quality, cleanliness and quality of gasoline, and the only difference between them is the level of octane content.
Note: The picture is taken from CCTV Finance's "Is it true?" column
03
Why produce gasoline with different octane levels?
Gasoline with different octane content is mainly to match the performance needs of different compression ratio engines, the higher the gasoline label, the higher the octane number, the better the explosion resistance; because gasoline combustion in addition to high temperature, but also can make the engine produce violent vibration. In general, the higher the compression ratio of the engine, the higher the required gasoline octane number;
If the high compression ratio of the engine is added with a low grade of gasoline, it will cause the engine to burn faster, and there will be a knocking situation, which will affect the normal operation of the engine.
Conversely, if a low-compression engine is added to a high-grade gasoline, it is easy to produce carbon deposits. The principle is very simple, because high-grade gasoline is not flammable, coupled with low compression than the engine cylinder pressure, it is easy to cause incomplete combustion, which and carburetor era "oil-rich" failure a meaning, burn not clean.
(Example of normal engine combustion versus abnormal combustion)
04
What labeled gasoline should I add to my car?
We only need to follow the instructions or the prompts on the fuel tank cover, go to the regular gas station to add the corresponding number of gasoline, there is no need to deliberately pursue high-grade gasoline, because this is the characteristics of the engineer for the engine, combined with China's oil products and other situations, after a long period of testing and tuning, the final calibration, has been able to meet the car operation standards.
brief summary:
Just like putting a sports car engine on a battery car, it doesn't play much of a role. So when we refuel the car, we must first understand what kind of gasoline is suitable for our car, not to say that the expensive is the best, and the suitable is the best.
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