I have a 19hp Kawasaki and I noticed today that oil was leaking from the mower. I cannot lind were it is leaking from. Oil is on the back bottom area of the crankcase. I did cheak the oil and I don't think they emptied my old oil during the service because it is about 1 inch above the full line. My Question is: With that much oil is there some sort of mechanism that will spill off oil if it is that high?