Is Minor Oil Leakage from the Oil Cap Normal?

1 Answers
VanCody
07/30/25 5:32am
Engine oil leakage from the oil filler cap is generally not a normal condition. The main reasons include: 1. Damage or aging of the sealing ring inside the oil filler cap, improper installation, or missing/broken baffle inside the valve cover. 2. Overfilling of engine oil or excessive pressure inside the crankcase. Consequences of an improperly closed oil cap: If the oil cap is not tightened properly, it may lead to excessive oil consumption. During normal operation, the engine reaches very high temperatures, causing some oil to vaporize. If the oil cap is loose, oil vapor can escape through the cap. Additionally, during engine operation, some gases may pass through the piston rings into the crankcase, increasing crankcase pressure and making it difficult for the pistons to move downward.
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