Oil on Spark Plugs A Sign of Engine Distress

It's the spark plug o-rings. Just take off the valve cover and replace them. There are 4 total and are included with the valve cover gasket set. While it may look like dirty oil, it isn't, this is unburnt fuel that all the lighter elements in the fuel have boiled off leaving the heavier ... I've seen varnish build up on the threads (from the fuel vapors), and it does not wipe off like oil. It takes carb cleaner to remove. If you have oil on the spark plugs then you most likely have faulty piston rings or valve stem seals. You'll need to do a compression test. If ... If you have oil in your spark plug hole then there is a 99.99% chance that the valve cover gasket is the culprit. Oil is getting on your plugs from inside the cylinder. There's only 2 ways that can happen. It's coming from the top (valves) or through the ... Valve cover gasket leaks are very common after a number of years. These gaskets dry up and shrink, and the leakage often is both outside, and ... In most cases, oil on the spark plug threads indicates that you have a leaking valve cover gasket. This gasket sits between the cover of the ... That's usually a sign that the spark plug tube seal is leaking. Likely need to get a valve cover gasket kit, remove and replace the valve cover ... oil in the spark plug tube indicates that the tube seal has failed. The only way to resolve this is by replacing the valve cover itself as well ...