Where is the oil, on the plug electrode or up on porcelain section where the plug lead goes as if it is the porcelain section it is probably just the rocker cover leaking down the plug hole which is good news :!:
Easiest way to find out is get it compression tested.Ant garage should have one but if they're gonna charge you for it then buy your own-about £20 from Halfords.Compression should be around 10-11bar(147-162ish psi) in each cylinder with no more than 1 bar(14.7 psi)or so difference between them.
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