Can Sinopec and PetroChina gasoline be mixed?
2 Answers
As long as the gasoline specifications are correct, Sinopec and PetroChina gasoline can be mixed. Below is relevant information about automotive gasoline: 1. Anti-knock property: The evaluation index for gasoline's anti-knock property is the octane number, which is the gasoline's grade. It represents the ratio of the actual gasoline's anti-knock performance to that of standard gasoline. Standard gasoline consists of isooctane and n-heptane. Isooctane has good anti-knock properties, with its octane number set at 100; n-heptane has poor anti-knock properties and is prone to knocking in gasoline engines, with its octane number set at 0. 2. Principle: The main basis for selecting gasoline grades is the engine's compression ratio. Parameters such as compression ratio and ignition timing have already been set in the engine's computer. As long as car owners strictly follow the instructions to choose gasoline, there will be absolutely no problem.
I've been driving for over a decade and often encounter situations during long trips where I can't find a PetroChina gas station, so I have to fill up at Sinopec, or vice versa. To be honest, both types of fuel are national standard gasoline with the same octane rating, and their base oil formulations are quite similar. National regulations require compatibility, so mixing them occasionally isn't a big issue. In the short term, it won't damage the engine or clog the fuel injectors. However, there are slight differences in additives—Sinopec's formula includes more cleaning components, while PetroChina's has better antifreeze properties. Mixing them might slightly reduce combustion efficiency and increase the risk of carbon buildup. For the long term, it's advisable to stick with the same brand to help the vehicle adapt and to perform regular fuel system maintenance. On highways where gas stations are scarce, mixing fuels in an emergency is perfectly fine, as long as it's not done long-term. This approach protects engine longevity and avoids unexplained increases in fuel consumption.