I found some oil on the tread of the plug(cylinder1)... no smoke though. It only occurs in cylinder 1. Did a compression test and the result are good 230, 225, 230, 230. I chaged the valve cover gasket and the 4 rubber spark plug gaskets and still no cigar. Any thought?? when I chage it with a new plug I see it start from the base of the plug...then to the tread and to the tip... Any thoughts or suggestion.

As a matter of fact, I switch to synthetic oil (mobil1 10w30) a month ago...could it be the oil???

 

I'm seeing the same thing...My cars not even running yet...

Ill hafta see the CR\Leakdown numbers...

Dave

 

My cars been running strong with out smoke or any other problems...Its just the oil on plug #1 that bothers me....

Come on ppls, someone must know something....

 

My plugs always have oil on the threads... but I am sure mine is from the valve cover leaking. Are you sure it is not leaking still?

Oil on the threads is almost always caused by a leak above the plugs.

Dustin