I just finished replacing my platinum plugs for copper sparkplugs today and noticed when I pulled out the plug from the rear passenger side, that there was oil or some kind of fluid on the threads. The threads weren't "drenched" in this oil, just enough to notice it on my fingers.
Does anybody know why that is there? Am I looking at eventual engine problems? Is there any way I could fix/prevent this?

 

Here ya go. This was last week. Sound like a similar problem. At least look into the second page before posting a common question. http://forums.maxima.org/showthread.php?t=302503