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[Nick W]

I don't lubricate plugs but I would put a drop of oil on the threads if I thought there was going to be an issue getting them out.

whoever fitted the plugs on this week's Yak 18t didn't use copperslip. 3 of them loosened properly; the other 15 needed a long ratchet, fluent anglo-saxon and some prayer. I never fit plugs without lubricant.

[Marks DTM Calib]

I don't lubricate plugs but I would put a drop of oil on the threads if I thought there was going to be an issue getting them out.

whoever fitted the plugs on this week's Yak 18t didn't use copperslip. 3 of them loosened properly; the other 15 needed a long ratchet, fluent anglo-saxon and some prayer. I never fit plugs without lubricant.

On the old tapered seat plugs I would agree (ala the horrific abortion that was the Ford pushrod where the plugs were mounted at the front in the wet and spray with a tapered plug seat) then yes I would agree.

The modern plug its not an issue IF its fitted correctly 

[Kevin Wood]

whoever fitted the plugs on this week's Yak 18t didn't use copperslip. 3 of them loosened properly; the other 15 needed a long ratchet, fluent anglo-saxon and some prayer. I never fit plugs without lubricant.

Correct response is, of course, to "take it for an Italian tune-up" to see if the heat loosens them.

 

[omega2018]

I don't lubricate plugs but I would put a drop of oil on the threads if I thought there was going to be an issue getting them out.

forgot to mention,  engine oil contains copper molecules....

[Doctor Gollum]

You've made your point