What is the difference between 95 and 92 gasoline grades?
2 Answers
Introduction to the differences between 95 and 92 gasoline grades: 1. Different applicable compression ratios: Generally, vehicles with compression ratios between 8.5-9.5 should use 92 gasoline; vehicles with compression ratios above 9.5 should use 95 gasoline. 2. Different octane levels: 92 gasoline has a lower octane value than 95 gasoline. Specifically, 92 gasoline contains 92% isooctane, while 95 gasoline has an octane value of 95%. 3. Price difference: 92 gasoline is cheaper per unit than 95 gasoline. Here are some related points: 1. Strictly speaking, 92 and 95 gasoline should not be mixed, but their chemical compositions are relatively similar with strong anti-knock capabilities. Mixing them usually doesn't cause major issues, but for vehicle safety, it's best to use them separately. 2. In some regions, lower-grade 90 gasoline exists. Mixing it with higher-grade gasoline can cause knocking, power loss, and affect spark plug lifespan, while also increasing exhaust pollution.
I've driven many cars using both 92 and 95 octane fuel. The 95 octane has about three points higher octane rating than 92, mainly offering better anti-knock performance. This means it burns more stably in high-compression engines and is less prone to engine knocking issues like that 'thumping' sound. For example, my SUV requires 95 octane – if I use 92, I feel a lack of power during acceleration, and prolonged use might damage the engine, such as causing spark plug carbon buildup or piston damage. On the other hand, regular compact cars run perfectly fine on 92 octane; while using 95 won't harm the engine, the extra cost isn't worthwhile. The recommended fuel grade is usually specified in the vehicle's manual – just follow that. Additionally, knock risk increases in high temperatures, making 95 octane more reliable in summer, whereas the difference is negligible in winter. Overall, fuel selection should be based on your car's requirements – don't blindly believe higher octane is always better.
