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What are the hazards of using 92-octane gasoline in a Passat?

1 Answers

StKhloe

08/29/25 3:12am

92-octane gasoline's anti-knock performance cannot meet the requirements of the Passat's engine, causing the engine to malfunction. It is essential to use the appropriate gasoline as specified by the vehicle's fuel requirements. Below are the detailed explanations: 1. The primary function of gasoline octane ratings is to indicate anti-knock performance, not the quality of the gasoline itself. Higher octane ratings do not necessarily mean fewer impurities. Gasoline with higher octane ratings offers better combustion stability, preventing engine abnormalities due to knocking. High-compression engines should not be filled with low-octane fuel. 2. Mid-range cars with a compression ratio between 8.5 and 9.5 should generally use 90-octane (National IV) gasoline, while cars with a compression ratio above 9.5 should use 93-octane (National IV) gasoline. Using low-octane gasoline in a high-compression engine can lead to a sharp rise in cylinder temperature, incomplete combustion, severe engine vibration, reduced power output, damage to engine components, increased fuel consumption, and poor driving performance. Conversely, using high-octane gasoline in a low-compression engine can cause "delayed ignition," where the fuel does not reach its auto-ignition point at maximum compression, leading to incomplete combustion, which is also detrimental to the engine.

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