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Hello Dave, my name is XXXXX XXXXX I can help you with this problem. There are two common causes for gas leaking into the engine oil. The most common cause is a faulty carburetor float or needle valve allowing gas to leak into the intake and then into the crankcase. To check for this problem follow these steps. 1  Shut off the gas to the carburetor, if your mower doesn't have a shut off valve simple pinch the fuel line with a pair of vice grips. 2  Using a wrench remove the carburetor bowl retainer, this may look like a bolt head or a nut with an adjustable valve through it.
Pressure from the engine can put stress on the oil filler cap, causing oil to leak out, if the cap is broken, loose, or even missing. Valve Cover Gasket. The most common site of leaking oil in automobiles is the valve cover gasket. It is a seal that prevents leakage and joins the valve cover and the engine. Oil is drawn to the top of the engine from the bottom and collects beneath the valve cover, slowly draining back into the engine via drainage holes.