Combat the destructive negative effects of ethanol fumes with STP Ethanol Fuel System Treatment + Fuel Stabilizers. Use the expertly designed formula with any gasoline 2 or 4 stroke engine, applying regularly when filling up your tank. The Fuel System Treatment helps to obstruct harmful corrosion that takes hold over time, while simultaneously preventing deposits from building up. The treatment also helps to stabilize fuel, ultimately prolonging the life of your engine. Treat up to 40 gallons with this bottle alone!