Spark Plug Oil A Diagnostic Tool for Engine Troubleshooting

The oil on the threads is from blow by and that it is normal operation. Car still runs well since installing new plugs. Attachments ... Preview image for a collapsed post. ... Probably is bad valve seals, the experts will chime in but you will have to replace the ... 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 ... While using a nickel based anti-seize compound is acceptable. Never use oil. The area where the spark plugs screws into can get hotter than what ... If is running too "rich" then you should see black smoke, when it is extreme, and see a black build up on the plugs. I would also expect codes ... 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 ... Thats called corona and is a naturally forming gunk caused by the electric field around the outside of the plug. The oil is probably coming from ... 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. 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 most common oil on spark plugs symptoms can include the following ... 1. Blue smoke form exhaust ... 2. Reduced fuel economy ... 3. Reduced engine ...