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From the engine manufacturer Briggs & Stratton's website on equipment storage:
Fuel
Top off the fuel tank before storing.
Filling the tank helps prevent moisture from condensing in your fuel tank, and stops rust and scale before it starts.
Before you fill up, add Briggs & Stratton Fuel Stabilizer to the fuel.* Then, run the engine for a few minutes to circulate the additive through the carburetor. The fuel stabilizer will help prevent gum from forming in the fuel system or on essential carburetor parts.
Oil
While the engine is still warm, change the oil and the oil filter (if equipped).
Briggs & Stratton 4-cycle motor oil is available in two sizes, 18 oz and 48 oz, and is available through your local dealer, retailer, or online.
Note: if you choose not to use the Briggs & Stratton Fuel Stabilizer, or if the engine is using fuel containing alcohol, such as gasohol, remove all fuel from the tank and run the engine until it stops from lack of fuel.
