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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.
The simple answer is that gas is getting into the oil passages/compartments. With out knowing more details, my guess is that there is excess gas being injected or leaking into the cylinder(s). The combustion stage is unable to burn off all the gas and the excess is leaking pass the piston rings and entering the crankcase, thus mixing with your oil. A few things to check: