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For the most part, oil will leak out and make a complete mess off your engine and driveway. If the oil leaks on an exhaust part there is a small chance of fire, although a slow leak usually just results in some smoke and odor. A failing valve cover gasket may also let oil into the spark plug wells which can prevent ignition and damage ignition components over time.A severe leak that is left unchecked may drop oil levels to the point that the engine is damaged internally.

Valve cover gaskets are usually cheap and easy to replace, although some models may require a moderate amount of labor to access the covers.

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Q: What side effects does a bad valve cover gasket have on a car?
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