What are the consequences of mixing Sinopec and PetroChina gasoline?

[OCalvin]

Gasoline from different gas stations and brands can be mixed as long as they have the same octane rating. If the octane ratings are different, even gasoline from the same brand should not be mixed, as this can lead to abnormal combustion, causing engine knocking. Besides damaging the combustion chamber, knocking can more directly affect the normal operation of the engine, and in severe cases, may lead to engine damage. To determine the appropriate gasoline grade for your vehicle, you can refer to the car's user manual or check the fuel grade marked on the fuel tank cap. How to handle adding the wrong gasoline: If you add gasoline with a higher octane rating than specified for your car (e.g., adding 95 octane when 92 octane is required), simply consume it normally and then switch back to 92 octane gasoline. If you add gasoline with a lower octane rating than specified (e.g., adding 92 octane when 95 octane is required), you can add a high anti-knock fuel additive. Alternatively, you can directly drain the fuel and refill with 95 octane gasoline.