What are the consequences of mixing Sinopec and PetroChina gasoline?

[ZacharyLee]

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 and engine knocking. Knocking not only damages the combustion chamber but also directly affects the normal operation of the engine, potentially causing severe engine damage in serious cases. To determine the appropriate gasoline grade for your car, refer to the vehicle's user manual or check the fuel grade marked on the fuel tank cap. Solutions for 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 switch back to 92 octane after consuming the current fuel. 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 drain the fuel and refill with 95 octane gasoline.