Can 92 and 95 Octane Gasoline Be Mixed?
2 Answers
92 octane and 95 octane gasoline can be mixed, as these two types of gasoline only differ in their anti-knock performance. This means lower-octane gasoline can be mixed with higher-octane gasoline for use. However, vehicles that consistently use 95 octane gasoline should not mix in 92 octane gasoline—in other words, higher-octane gasoline should not be mixed with lower-octane gasoline, as this may result in insufficient vehicle power. The higher the octane rating, the greater the isooctane value, and the higher the proportion of isooctane, the better the gasoline's anti-knock performance, which significantly helps curb carbon deposit formation after combustion. When gasoline is compressed in the engine combustion chamber to perform work, if its anti-knock performance is poor, it may ignite prematurely, causing knocking. Gasoline with good anti-knock performance prevents this from happening. The higher the engine's compression ratio, the higher the requirement for the gasoline's anti-knock performance.
I've been working in car repairs for nearly twenty years and have seen many car owners run into problems from mixing fuel grades. The difference between 92 and 95 octane gasoline lies in the octane rating—92 has a lower octane value while 95 is higher. When mixed, the fuel burns unevenly in the engine, which can cause knocking—a condition where ignition occurs prematurely, leading to engine knocking, louder noises, and part damage. An occasional mistake won’t immediately ruin the engine, but doing it frequently will reduce engine efficiency, increase fuel consumption, and produce black exhaust smoke. Over time, piston rings may wear out and require replacement, which isn’t cheap. It’s best to strictly follow the vehicle manual’s fuel requirements. If 92 octane isn’t available, it’s better to drive farther to find the right gas station. Don’t skimp on this small expense during routine maintenance—engine failure is no joke.
