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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.
Found this at a smog check center: In my experience, it was engine oil caused by a defective head gasket. The oil was leaking out and burning off from the heat of the engine. The oil dripping onto the floor was clear and slightly brown, and the smoke was white (as Al says, probably to my untrained eye). Views Â· View Upvotes.