Bet you guy's thought you saw the last of me, huh? Been working on a mercury cougar for the past month! Anyway, Took the truck on a drive, noticed it was missing slightly on cylinder #1. Wasn't too worried, turns out the plug is a different model than the 7 Others. Previous mechanic must have gotten one mixed up somehow. However...There is Oil on the beginning of the threads, but the rest of it looks decent. Honestly, I'm wondering if someone spilled oil off the valve cover and it made it's away down there. The end of the spark plug looks decent, I'm not even sure how oil could be in the combustion chamber to that amount and not destroy the plug, much less how it would get there without me noticing a major issue. I'm gonna replace the plug with the correct model and monitor it, maybe it's just a random occurrence. Just wanted your guy's opinions. Thanks!