What does oil in the spark plug hole mean?
What does oil in the spark plug hole mean? When a spark plug well fills with oil, it means that the O-ring that seals the well to keep out oil and debris has deteriorated and started to leak. Although the leak can sometimes be fixed by tightening the valve cover bolts, more often than not the valve cover gasket and well seals will need to be replaced. How to fix engine that's leaking oil on spark plugs? How to repair an engine that's leaking oil on the spark plugs by replacing the spark plug tubes and valve cover gasket. Spark...