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this is a term commonly refered to as "making oil" usually the cause of this is faulty fuel injectors, that allow fuel to drip into the combustion chamber the entire time the engine is off. the fuel then seeps past the piston rings directly into the crankcase. there are other ways of fuel entering crankcase, depending on the type of engine. a faulty mechanical fuel pump can also be a way for fuel to enter the crankcase.

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