Quote:
Originally Posted by Avulon
Grease on spark plug threads, even copper grease can be an effective insulator preventing the plug from earthing (cue several hours trying to work out why an engine won't start) a small smear can be got away with - but not needed. Grease should never be needed on either spark plugs or wheel bolts/nuts.
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Grease on a plugs threads, ( It will be thin if the plug is up tight. ) won't be any kind of barrier to 25,000 plus volts.-----
A shocking reply, but true.----
