Oil-Soaked Spark Plugs Unlocking the Clues to Engine Performance

The oil on the threads is from blow by and that it is normal operation. Car still runs well since installing new plugs. 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 ... Most likely you leaking oil through this gasket down into the spark plug well. Check this 1st. if that is the problem just get some gasket sealer and repair it. Oil in the spark plug tubes is caused by shrunken and hardened spark plug tube seals, which can easily be replaced by just pulling the valve covers. 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. 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 ... Spark plugs have oil. How to fix oil on spark plugs and valve cover gasket replacement in your car DIY with Scotty Kilmer. How to repair an ... Look at your valve cover gaskets/spark plug gaskets and make sure they aren't leaking. If they are oil can get into the spark plug holes and ... 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 ... If there is any question, the spark plug tube seal is offered by GM - Part Number 12607600. "Window shopping" for a Silverado isn't all that bad ...