I bought a 446 Case this spring and it's in fairly decent shape. The problem is that the oil was absolutely filthy when I brought it home. I mow about an acre of grass and change the oil, It's getting better but the drain plug will be worn out soon from taking it out so often.
Any ideas on how to flush the crankcase and get the oil cleaned up a little quicker. It's a 16 hp onan but Ingersoll didn't put oil filters on this model.