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Is it normal for a car to spray gas violently when opening the oil cap?

1 Answers

VanAdalynn

07/30/25 4:30am

Normally, when unscrewing the car's oil cap, there will be slight changes in positive and negative pressure, meaning it's common for the oil port to spray gas. However, if the spraying is excessive, it's abnormal, and the wear condition of the piston rings needs to be checked. Additional information: 1. A large amount of black sludge on the oil cap: This phenomenon indicates severe carbon buildup in the engine, suggesting increased fuel consumption, reduced power, and gradually increasing noise. In such cases, it means the engine is severely damaged and requires immediate repair. 2. Oil emulsification on the oil cap: Emulsified oil means it is almost or completely deteriorated. Fully deteriorated oil can cause certain damage to the car. If this situation occurs, go directly to a repair shop to clean the engine thoroughly and replace the oil afterward.

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