I've replaced the rear main 3 times already, and everytime it develops a leak again. The leak takes a while (200 - 300 miles later?) to come back each time. Last time I was under there, I noticed that my flywheel is missing a few teeth ..... alright, it's missing quit a few teeth. Would missing teeth on the flywheel cause vibration in the crank and therefore a leak in my rear main seal? I know I need to replace the flywheel anyway, I just want to know if this would be the cause of my continuous leaky rear main. Thomas.