I just did a throttle body clean and spark plug replacement on my 2008 G37s Coupe which has almost 76k miles on it. Everything looked good except for oil on the threads and top of one of my spark plugs. I had oil on the plug wire closest to the spark plug as well. The other five plugs were bone dry. Doing a little research, this could be the plug tube seal and/or the valve cover seal. Is this something that needs immediate attention or can I just monitor this for now and deal with it later? The car runs well and I would never have noticed if not for the plug replacement.

I welcome any thoughts or suggestions.

 

Which plug had oil on it? Are there any oil leaks that you've noticed anywhere? How is your car running?

 

The plug that had the oil on it was on the driver side closest to the firewall. The car runs fine and I have never noticed any leaks anywhere. I did add some oil since it was on the low mark, but i didnt do the last oil change so I dont know exactly where the level was at the time it was done. I will be monitoring it closely from now on to see how much I am burning. I do drive my car hard out here in the desert since I am so remote from everything and I have a heavy foot