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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.
A: A spark plug with dual or more head may cause the increasing of combustion chamber temperature even it also burn the fuel totally, the same effect is also happen when the spark plug being replace with higher heating level. When the cooling system is fine, it may fine. But if what happen is the contrary, the burning oil will cause the oil to vapourise. Beside a cooling reason, a worn piston ring and valve seal may also cause the oil to vapourise. If the oil is also being changed, please take a look at the oil viscosity and grade, a lower viscosity and a synthetic oil may easy to burn by heat.