Spark Plugs and Wires
Ford Explorer Sport
Ford Explorer XLT

What causes oil on spark plugs?


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Wiki User
2014-07-03 19:02:19
2014-07-03 19:02:19

On the business end of the plug.

Wet, oily deposits. Will cause weak spark and eventually misfire.Fault: worn bores/piston rings or valve guides; sometimes occurs (temporarily) during running-in period. Plugs can be re-used after a thorough cleaning. For Pictures.

On the outside of the Plug. Oil would be from a Leaking Gasket or Seal.


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Leaking valve guides in the head will cause oil to get around the spark plugs.

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Time to replace seals, this usually causes misfire.

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No, but burning oil will give you bad spark plugs.

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This is often a cracked head gasket between oil passage and a cylinder.

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Bad Rings. Get your Rings replaced asap.

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