What do 92, 95, and 98 mean?

[LeBethany]

92, 95, and 98 are the octane ratings of gasoline. Here are the detailed explanations: 1. Meaning of the ratings: Gasoline with different octane ratings has different levels of octane. The higher the octane rating, the higher the octane level, and the better the stability of the gasoline. Some cars require the use of 92 gasoline, while others need 95 or 98 gasoline to prevent engine knocking. 2. Anti-knock properties: Knocking is an abnormal combustion phenomenon in the engine that occurs during the compression stroke. During the compression stroke, both the intake and exhaust valves are closed, and the engine's piston moves upward to compress the air-fuel mixture. The temperature and pressure of the compressed air-fuel mixture increase. If the gasoline's stability is poor, the air-fuel mixture may ignite prematurely. The burning mixture pushes the piston downward while it is still moving upward, which can negatively affect the engine's power output and fuel efficiency.