Can a Car That Uses 95 Octane Gasoline Use 92 Octane Instead?

1 Answers
KendraDella
07/29/25 4:35pm
A car designed for 95 octane gasoline must not use 92 octane gasoline for an extended period, for the following reasons: 1. The main difference between 92 octane and 95 octane gasoline lies in their octane ratings, with higher octane ratings indicating greater resistance to knocking. 2. Generally, a car engine has a specified compression ratio, which determines the appropriate gasoline type. A compression ratio between 8-10 requires 92 octane gasoline, while a ratio above 10 requires 95 octane. 3. If a high-compression engine uses 92 octane gasoline, premature combustion (knocking) can occur, leading to engine knocking. This may cause unstable idling, reduced power, increased fuel consumption, and in severe cases, bent engine valves or even damage to the valve cover. Therefore, a car designed for 95 octane gasoline must not use 92 octane gasoline long-term, except in emergencies when the vehicle runs out of fuel.
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