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Oil on the outside of the plug, usually means a leaking valve cover gasket. Oil on the plug electrode, means your engine is burning oil, which usually means bad rings, bad valve seals, or a combination.

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19y ago
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15y ago

Oil on the top of the plug would be do to a gasket or seal failure. Oil on the bottom of the plug would be do to a serious internal engine failure.

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Q: Why is oil on your spark plug?
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Related questions

Why is oil in spark plug hole?

if the oil is at the spark plug base the valve cover gasket is leaking. if the spark plug electrode is covered with oil the engine needs rings


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If you mean on the exterior of the spark plug then the valve cover gasket is leaking. If it is on the electrode of the plug you are burning oil.


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