What to Do If the Car Originally Used 95 Octane Fuel and Now Switches to 92 Octane?

1 Answers
VonAlivia
07/29/25 1:33pm
No impact. 95 octane is essentially the previous 93 octane gasoline, just with better additives. The differences between 92 and 95 octane gasoline are as follows: 1. Different proportions of n-heptane and isooctane: The biggest difference between 92 and 95 octane gasoline lies in the proportion of n-heptane and isooctane. Different gasoline octane ratings represent different anti-knock properties. 92 octane gasoline contains 92% isooctane and 8% n-heptane, while 95 octane gasoline contains 95% isooctane and 5% n-heptane. 2. Different engine compression ratios: Using 92 octane and 95 octane gasoline results in different engine compression ratios, as the combustion speeds of the two fuels differ. The higher the octane rating, the slower the combustion speed, and the better the anti-knock performance, requiring a higher engine compression ratio. If lower octane fuel is used, the combustion speed is faster, the anti-knock performance is poorer, and the engine's compression ratio decreases, leading to faster combustion speed.
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