As some of you know by now the rear main seal is leaking on my jeep 4.0 engine. I put some STP stop leak in it before the last oil change, and that did slow it down quite a bit. Anyway...2 days ago (about 50 miles) I made sure the oil was exactly at the full mark so that I could see how bad my leak was. Today I checked it, and the oil is about 1/8" ABOVE the full mark! What the heck?!? Both times it was checked about 15 minutes after using it. I know it's still leaking...there's a small puddle on my garage floor.