What happens if 95-grade fuel is added to a car that requires 92-grade?

1 Answers
DelElliott
07/29/25 4:03pm
If 95-grade gasoline is mistakenly filled into a car that requires 92-grade, the result will be engine knocking. Here are the relevant details: 1. Standard gasoline consists of isooctane and n-heptane, and the difference between 92-grade and 95-grade gasoline lies in their proportion ratios. 2. Specifically, 92-grade gasoline is composed of 92% isooctane and 8% n-heptane, while 95-grade gasoline consists of 95% isooctane and 5% n-heptane. The octane rating indicates the fuel's anti-knock performance—the higher the rating, the stronger the anti-knock capability. However, contrary to popular belief, higher octane does not necessarily mean better performance. The appropriate gasoline grade should be selected based on the engine's compression ratio.
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