Can Sinopec 92 and PetroChina 92 be mixed?
2 Answers
Sinopec 92 can be mixed with PetroChina 92, which will not cause damage to the car, nor will chemical reactions occur between the gasolines. However, mixing gasoline of different octane ratings may cause engine knocking. Knocking is an abnormal phenomenon in the engine. When the piston is in the compression stroke and moving upward, it compresses the combustible mixture, increasing its pressure and temperature. If the gasoline's anti-knock performance is poor, the combustible mixture may ignite prematurely, causing knocking. The burning mixture will push the piston downward while it is still moving upward, potentially damaging the engine and reducing its power. Severe knocking can even lead to piston cracking and connecting rod deformation. If the vehicle requires 92 octane gasoline, do not use gasoline with a lower octane rating. If the vehicle requires 95 octane gasoline, do not use gasoline with a lower octane rating.
I'm a regular user driving an old car and have mixed Sinopec 92 and PetroChina 92 a few times without major issues. Both meet the 92 octane standard mandated by national standards, so the engine basically runs as usual. I remember once on the highway when only Sinopec fuel was left, I filled up with it and later topped up with PetroChina, and the car's acceleration remained just as stable. There might be slight differences in additive packages, like the amount of detergents, but it doesn't affect daily driving. For long-term mixing, I suggest doing it occasionally, as constantly switching brands might lead to slightly more engine carbon buildup. During maintenance, I had a mechanic check the fuel filter, and it was normal. In short, mixing in emergencies is safe, but sticking to one brand usually reduces risks.
