so maybe a layer of Coppaslip is a good move.
John have you ever tried pencil lead on the threads. Someone told me its a different type of carbon and it wont allow the threads to foul up when the plug is in the head. what do you think?
We tend to go for the recommended plugs as John said.
I've certainly never tried that, and I haven't considered Stivino's issue either. To be honest I rarely use anything, but having had real problems removing taper seat plugs from the Focus I tend to use grease on those.
Slightly off track, I always coppaslip the sliding surfaces of brake pads and calipers.....and there's never a sign of the stuff a few months later.
John