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Re: spark plugs
You probably hust have a leaking valve cover. The oil is getting down into the spark plug area and you will have oil on the outside of the plug when you take it out. If the inside of the plug has oil like you desribe it would cause a rough running engine and smoke out of the exhaust. Is the oil on the inside? Yes, I'd worry. Is the oil just on the outside Yes, no worry. replace the valve cover gasket.
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