Need opinions from those who have replaced the rear main seal. I removed the torque converter inspection cover today to take a look because there is a blotch of oil near that area. I know what this could be so I went to take a look. Some oil seemed to have leaked out through the rear main seal at some point, however, it is not leaking now and is bone dry. Has any experienced something like this before where the rear main seal leaked then stopped leaking? I suppose it has something to do with the dry and cold winter months in the snow belt here. I have not moved away from 5w-20 synthetic oil since the car was new.