Oil on spark plug
#12
10-19-2009 | 11:37 AM
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Joined: May 2006
Posts: 18,398
From: Wisconsin
If your valvecover gasket leaks down into the sparkplug tubes, that will get onto the threads as you remove the spark plug.
The valves & rings will let oil into the combustion chamber, where it will show up on the FIRING TIP of the plug, and would be kinda blackened & burnt. Not nice clean new oil.
The valves & rings will let oil into the combustion chamber, where it will show up on the FIRING TIP of the plug, and would be kinda blackened & burnt. Not nice clean new oil.
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