Can't mix. According to the query related information: different brands of gasoline have different crude oil, Sinopec's crude oil is mostly imported from the Middle East. PetroChina has a lot of oil fields in the country, mainly concentrated in the northern region, such as Daqing, Liaohe, Karamay, so PetroChina is basically domestic crude oil. Different brands of fuel additives and different processing techniques, petrochemical and petroleum mixture, although the effect is not obvious at first, but over time it will damage the engine's working conditions, carbon deposits and shaking, affecting the car's power and ride comfort, and even shorten the life of the car engine.