Can 92, 95 and 98 gasoline be mixed？
Some time ago, Xiaobian published an article on popular science. Car owners urged Xiaobian in the background to talk about whether No.92, No.95 and No.98 can be mixed, and whether China Petroleum and China Petrochemical can be mixed.
Can I mix numbers 92, 95 and 98?
About this problem, we should start from the root, that is, the engine.
Because gasoline has low viscosity and rapid evaporation, an injection system can be used to inject gasoline into the cylinder, and after it is compressed to a certain temperature and pressure, it is ignited by a spark plug to expand the gas to do work.
Therefore, for engines with different compression ratios, the choice of fuel grade is different. The engine with high compression ratio should try to choose high-grade gasoline, and the gasoline grade of the engine with low compression ratio can be reduced appropriately.
Domestic gasoline numbers are classified according to China’s automobile gasoline standards. No.92 gasoline is the same as No.95 gasoline and No.98 gasoline in terms of oil quality and cleanliness, and the biggest difference lies in their octane number.
The proportion of antiknock agent added to 98 # gasoline is slightly higher than that of 95 # and 92 # gasoline. The quality of the two kinds of gasoline is exactly the same, which has nothing to do with cleanliness, etc. The only difference is that the amount of antiknock agent is different, which is also designed to meet the different requirements of engines with different compression ratios for antiknock value.
gasoline octane number
Gasoline label
isooctane
normal heptane
No.92
92%
8%
No.95
95%
5%
No.98
98%
2%
After understanding the meaning of gasoline label, let’s discuss a popular saying: high-grade gasoline has enough power and can prolong the life of the engine. Speaking of this, Xiaobian needs to popularize it for everyone: compression ratio.
Compression ratio is a very important structural parameter of the engine, which indicates the ratio of the gas volume at the beginning of piston compression at the bottom dead center to the gas volume at the end of piston compression at the top dead center. The compression ratio of the engine determines the fuel label.
In short, what kind of fuel to add to a car depends on the compression ratio of the car engine.
Suggested list of gasoline label selection
Compression ratio
Unleaded gasoline label
No.92
No.95
No.98
7.5-8.0
▲
8.0-8.5
▲
▲
8.5-9.0
▲
9.0-9.5
▲
▲
9.5-10.0
▲
Low-grade gasoline vehicle mixed with high-grade gasoline.
For example, the car originally used 92 # gasoline, but when it was almost used up, it was changed to 95 #, which mixed the two brands of gasoline. In this case, short-term use will not have much impact on the engine, but if it is added for a long time and blindly pursues high-grade gasoline, its high anti-explosion function will not be brought into play, and there will be a phenomenon of delayed combustion. The final result of this phenomenon is insufficient combustion, increased carbon accumulation in the car, resulting in environmental pollution and waste of resources.
Be careful here, don’t cross the label, it’s dangerous. If the car was originally burning No.92 gasoline and added No.98, it would be undesirable, which would damage the engine and even directly lead to the car’s dimple for a long time.
High-grade gasoline vehicle mixed with low-grade gasoline.
My car was originally filled with 95 # gasoline, but when I needed to refuel, I found that the gas station only added 92. At this time, if I choose to mix and reuse it, it is very likely that there will be insufficient antiknock performance, and the failure rate of the engine will increase, and the fuel consumption will increase, carbon deposition will increase, and the nozzle will be blocked.
Detonation will weaken power, increase fuel consumption, aggravate the wear of cylinder parts, shorten the service life, and even lead to engine damage and scrapping.
Finally, can China Petroleum and China Petrochemical be mixed?
Because there are national standards for the production of oil products, whether it is China Petroleum or China Petrochemical, our oil products must meet the national standards before leaving the factory, so there is no problem in mixing the oil products with the same label.
Although Xiao Bian said so, everyone must think, "There are no two identical leaves in the world", and there must be subtle differences in this oil. My car still wants stable oil.
As a car owner, it is understandable to think so, then try to fix it in one area and add the same brand of oil!
Of course, if you are afraid of uncertainty, it is better to choose a fixed gas station according to your fixed life rules.
Text | Song Qinghai
Source | Xinhuanet Tencent Auto
Original title: "Can 92, 95 and 98 gasoline be mixed? 》
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