Can Sinopec 92 and PetroChina 92 be mixed?

[VonIsaac]

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.

[DelEdward]

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.

[Kevin]

As someone with some knowledge about cars, I've tried mixing Sinopec and CNPC's 92-octane gasoline. The key point is that the octane ratings of both meet the 92-octane standard, and the national standard GB 18351 ensures the consistency of the base fuel. In terms of additives, different brands may adjust the proportions of detergents or antioxidants, but the engine control module can adaptively adjust. Short-term mixing is fine, and the car will still run smoothly; for long-term use, monitor engine performance to prevent additive conflicts that could cause deposits. Once, I mixed several tanks of fuel consecutively, and the fuel consumption increased slightly by 0.5 points, but it returned to normal after cleaning. It's advisable to avoid mixing in extreme cold or hot weather to prevent affecting additive stability. Overall, it's safe, so don't worry.

[HavenLynn]

I've been using household cars for ten years, occasionally mixing gas from different stations, such as Sinopec 92 and PetroChina 92, with no issues. No engine warning lights, and no loss of power. National standards mandate the same octane rating, ensuring compatibility. However, I personally don't recommend long-term mixing; differences in additive formulations may lead to carbon buildup, increasing maintenance costs. For temporary emergencies, like limited options at service areas, it's absolutely fine. Afterwards, try to stick to a single brand and maintain the fuel system regularly. This approach is worry-free and economical.