I think my oil seal is leaking on flywheel end on my 1864 cub cadet. If I remove driveshaft than I could take everything apart from there. Second choice is to take the engine out. I have to this week remove metal to make sure that my seal is leaking.It has 640 hrs on it, I have checked both valve covers really good,Also check the oil presure switch and front main seal. It leaks after It quick running,and when I go back check it after an hour,it will leave oil spot in the middle on the floor.THX