not sure why the gas is mixing with the oil on my riding lawn mower
brian lawton
June 2010
The needle in your carb is not shutting tight so the gas is going up and through your carb into your intake valve and leaks down your piston cyl into your oil. Do not try to start your engine it can cause a lot of internal damage. Get your carb fixed by replacing the needle and seat. Drain and put in fresh oil, then try to start. Good Luck
JOHN at Rona
September 2004
I can answer this question...
what causes gas to mix with the oil on a 15 hp craftsman riding lawn mower?