Can I switch from 92 octane gasoline to 95 octane?
2 Answers
Previously using 92 octane gasoline can be switched to 95 octane gasoline. If the car's requirement is not to use gasoline below 92 octane, then 92, 95, and 98 octane gasoline can all be used. If the car's requirement is not to use gasoline below 95 octane, then 92 octane gasoline cannot be used, and only 95 and 98 octane gasoline can be used. Below is the relevant content introduction: Usage of 92 octane gasoline: Suitable for models with mature engine technology that do not have excessive fuel requirements. Usage of 95 octane gasoline: 95 octane gasoline is generally suitable for turbocharged and high-compression models, and it is compatible with the vast majority of models currently on the market. Knocking phenomenon: Some cars require higher octane gasoline to prevent engine knocking, which is an abnormal combustion phenomenon in the engine. When the piston is in the compression stroke, it moves upward to compress the combustible mixture. After compression, the temperature and pressure of the combustible mixture will rise. If the gasoline's stability is poor, the combustible mixture will ignite prematurely.
I also struggled with this issue when I drove the old Corolla. Different engine compression ratios require different gasoline grades. It's completely fine to switch from 92 to 95, it mainly depends on your budget. 95 has better anti-knock properties, which might reduce engine vibration when climbing hills with AC on in summer, but the difference is hardly noticeable during daily commutes. I did some deliberate comparisons for a while – 95 does feel smoother on highways, but in city driving, there's basically no difference. However, when switching from 92 to 95, it's best to wait until the tank is nearly empty before refueling. Mixing a small amount is fine, but half a tank of 92 mixed with half a tank of 95 creates uneven octane distribution, and the engine might consume slightly more fuel during the adaptation period. If you suddenly switch back to 92 after long-term use of 95, it's recommended to first finish that tank of gas as a transition.
