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The most likely cause for gasoline in the oil is a defective carburetor float and/or needle valve. When defective they fail to completely stop the fuel flowing into the carburetor when the engine is stopped and sets for a week or so. The fuel slowly flows from the carburetor into the engines combustion chamber and eventually ends up in the crankcase with the oil.

DO NOT run the engine with gas in the oil or it will be destroyed. Purchase a rebuild kit for the carburetor or bring it to a small engine shop and repair the problem. Change the oil, run for 10 minutes and then change it again to ensure there is no residual gas in the oil.

Kevin

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Q: Why do you have gas in the oil of your Briggs and stratton motor?
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