Spark Plugs with Oil A Diagnostic Key to Engine Health

If oil persists in the spark plug threads or plug wells over an extended period, it becomes a significant problem. This can lead to several issues. The seals harden and crack over time. When this happens, oil seeps into the tube and coats the exposed part of the top of the spark plug. The ... Once the seals around or next to the plugs start to leak, oil can seep into the spark plug wells. You do not want this oil to get into the cylinder. This ... Make sure you replace those tube seals (that's what keeps the oil out of the spark plug tubes), they should come with the valve cover as long as ... 2013 2.5i Limited w/ 165k miles. What would be the most logical explanation for this? Piston rings? Spark plug O-rings? Valve covers? The source of the problem is a non-sealing valve cover gasket that leaks oil. Then, this oil can damage the coil packs. It could be a lot of things.. is the oil on the INSIDE of the cylinder, or on the outside where the spark plug wire boot connects? If its on the ... It's the valve cover gasket at the spark plug hole. It won't hurt anything. Ig you want to fix it you have to replace the entire valve cover. My ... If your getting oil in the area where the spark plugs are, especially the #4 one, then you need to change the valve cover gasket. Had same ... 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.