I just got done letting my car run until operating temperature and then took one of my plugs out on the driver side to see if I was running rich or lean. I pull the plug out and the electrode is a tanish color but the screw in part below that had like oil on it or something. It was not dark but it was a light brown and it was in the threads. Any idea what would be causing that? Do I have a bad O-ring or something and its leaking oil into the cumbustion chamber? Thanks

 

those actually sound fine, a rich car will have a wet plug(or black all over) and a lean car is white all over, meaning it's burning hot. The best way to check plugs is to drive the car normally and then check them, not just idling till it's hot.