Oil on Spark Plugs A Symptom of Engine Blow-by

This is the valve cover gasket leaking and maybe loose spark plugs as well. Lucky for you all you would need to do is either replace the gaskets and/or tighten ... The source of the problem is a non-sealing valve cover gasket that leaks oil. Then, this oil can damage the coil packs. Sounds like the spark plug tube seals are leaking. Not something that's going to cause catastrophic failure, but it may cause misfires if too ... 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. The dealer is telling me that oil is leaking into the spark plug tube through the cylinder head. The dealer is telling me it will cost $1400 to fix. If there is oil in the bottom of the well chances are the valve cover gasket is leaking. There is a seal around the bottom of each well. The spark plug being wet with oil could be from three things. 1. worn rings. 2. hardened valve guide seals. 3. stuck rings on that cylinder ( ... If it's above the threads, then it's probably a leaky valve cover gasket. If it's within the cylinder then you should check the compression on ... If you have oil in your spark plug hole then there is a 99.99% chance that the valve cover gasket is the culprit. The spark plug well oil seals are leaking. Anyone else seen this? Replacing the seals on the valve covers is a lengthy process. Can these be fixed without ...