Help Needed! I have a Kohler Comander 23 that is leaking oil either around the oil filter or just behind it. What is behind the filter that would cause a leak? Gasket? I had the oil changed and noticed some oil on the deck after untrailering it. I checked the oil and it seemed ok. Ran the unit for about 20 min and checked it again still ok but still some oil on the deck. I left the unit for a couple of hours and returned to find oil all over the floor. The stick now reads about half. I have not started it since and plan to return to the shop. Any ideas?