Use every fill up. Fights: Rust & corrosion. Improves gas quality. Cleaning since 1945. Prevents future deposit build up. Fights rust and corrosion. Removes water to help reduce gas line freeze. Gumout gas treatment. Use of a low-quality discount gasoline can reduce your engine's performance. Your vehicle may experience poor fuel economy, lost horsepower, and even fuel line freeze because of water in tank. Gumout Gas Treatment helps to: Prevent future deposit build up. Fight rust and corrosion. Remove water to help reduce gas line freeze. This product contains no alcohol and will not harm catalytic converters or oxygen sensors. Can be used with all unleaded, oxygenated and reformulated gasolines. Safe to use with other Gumout fuel additives. Treats up to 21 gallons (80 lt) of gasoline. Made in USA.