My Toro 518XI mower has a Kohler engine with a problem, engine Info--- Family SKH624U1G2RA,,,MODEL CH18S,,,SPEC #62579,,,DISP. 624CC,,, SER.#273241450T. It is loosing a lot of oil. I fixed a leak last year at the cover over the breather reed. Toward the end of the mowing season the top of the...