I try not to use it much anymore because it uses so much hydraulic oil. I lifted up the seat to view the top backside of the starter, and it's bubbling between the starter and the housing. The leak seems to be from the bottom side of the starter and then running down the engine as you see in the pictureComing out of starter? If black, rear main seal of engine. If lighter, input shaft seal of hydro pump. Mine was hydro.