Safeguard your engine against common ethanol problems with Briggs and Stratton Advanced Formula Fuel Treatment and Stabilizer. This 5-in-1 fuel stabilizer has triple anti-oxidant protection to maintain fuel stability for up to three years. Dual corrosion inhibitors protect engine parts from corrosion while water protection inhibitors protect against the harmful effects of water in fuel. The metal de-activator stops chemical reactions, while detergent prevents gum and varnish build-up. Use this lawn mower fuel stabilizer with two- and four-cycle gasoline engines.