Why do I get oil on outside of sparkplug no.3 and plug lead.

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Elibomrod

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Hi, I seem to regularly get oil on insulator of no 3 sparkplug, and also on lead end....
checked someone else's van and no 3 was the dirtiest too.
Can't work out the oil path any ideas?

That plug does have a thread insert...but don't think it's related.
 

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