Spark plugs I have a 93 Lexus GS 300. The motor was running ruff, so I decided to tune it up and I found oil on the three of the six old plugs. Whats the cause of finding oil on & in the plugs & on top of the pistons? I was told it's the valve cover gaskets but theres no sighns of leaks?
Cars & Trucks - Lexus - GS 300 - 1994 Lexus GS 300
Answers & Comments
Who ever told you it was the Valve cover gaskets was correct. On the valve cover gasket around where the spark plug goes down though the head there is a seal made onto the valve cover gasket called the spark plug well seals. when replacing the valve cover gasket it will come with these seals and it will take care of your oil leaking into spark plug holes. Hope this has helped and if you need anymore assistance I would love to help.