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What causes oil on spark plugs?

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โˆ™ 2014-07-03 19:02:19

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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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โˆ™ 2014-07-03 19:02:19
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