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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.
When there is coolant contamination present in the oil it usually means the head gasket is blown. During the presence of a coolant leak, the cooling system drops in pressure, which causes the engine to overheat. Another cause of a leak could be due to a damaged intake manifold gasket. If the intake has ports for coolant lines, the gasket can pop, causing contamination. To repair this problem the gasket will need to be replaced, the oil drained and the coolant flushed. Learn more about Engine Oil