I was prepping my mower for winter storage, by changing the oil and filter in my Kohler 25 HP Command. Nothing abnormal, but after adding 10w30 Pennzoil synthetic (which I don't think had anything to do with the problem, as I have used it many times before) I started up the mower and the oil light did not go out. Normally after 3 seconds or so, the oil light would go out. After about 20 or 30 seconds, the engine came to an abrupt stop. I cranked the engine again, and it started up, but it was starting to get noisey (lifter noise). I unscrewed the oil filter and it was totally dry. Thinking the oil filter was bad, (Kohler filter) I put on another new Kohler filter. Started the engine again and let it run for about 10 to 15 seconds. Again, the oil light did not go out and it stopped abruptly. Fortunately, the engine is not locked up, but I need to find the problem. Has anyone else had this issue before? I suppose the oil pump could be bad? What other tests can I do? Could an oil passage be plugged?