Oil on Spark Plugs A Symptom of Underlying Engine Problems

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 ... Put a rag over the spark plug hole. Using a long-nozzle blow gun and blow out as much oil as possible. Spray in some brake clean. Repeat. All you need is a valve cover gasket set. You simply undo and take the valve cover off, give it a clean and pop the gasket out gently where the spark plugs go. What can cause oil on spark plugs? · Worn valve guides or intake valve seals · Worn-out or broken piston rings · A blown head gasket · Clogged ... Check to see if you have any oil residue in the plugg tube, and if you do, you have to replace spark plug tube seals, it it involves pulling off ... Oil seeps down the hole that the tube is mounted into. It gets in there when the sleeve retainer seal (similar to Loctite) breaks down. You may ... Spark plug tubes have o-rings that go bad , may want to tighten valve cover also. Spark plug tubes harden where they meet the valve cover. This will allow oil to pass over time. You might be able to reuse the valve cover but ... The rubber seals on the spark plug tubes are probably leaking, remove the valve cover pull out the sleeves and see if the rubber seals have ... If you have oil in only one of the cylinders, most likely either the valve cover gasket is leaking or the head gasket is leaking.