Unraveling the Truth Causes and Impacts of Oil on Spark Plugs

Oil can deteriorate sparkplug leads and the boot that goes over the insulator of the sparkplug. This can result in missfires. Oil in the spark plug wells is symptomatic of a valve cover gasket leak. Not a really difficult DIY job - perhaps 2 hours the first time through ... 2010 1.8 L Honda engine's spark plugs do not go through the valve cover. Maybe the valve cover is leaking and entering the spark plug tube below the valve ... 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 ... The odds-on bet is a blown head gasket. Of course, there are other ways to get oil there. If it is only oil on 1 spark plug then you can rule out the easy to ... That high on the plug may be a very slight leak of the valve cover gasket. I've seen some swimming in oil. But what you have is nothing to even think about ... If you have oil in your spark plug hole then there is a 99.99% chance that the valve cover gasket is the culprit. Spark plug tube seals are starting to dry up and let oil by. Buying a valve cover gasket set will give you new tube seals along with cover ... 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 ... While oily spark plugs can indeed point to an engine problem, the issue can also result from oil leaking into the spark plug wells.