Diesel Formula STA-BIL is designed for use at every fill up and keeps diesel fuel fresh. It prevents sludge and sediment from forming in the fuel, protects against corrosion, reduces oxidation of diesel fuel caused by thermal breakdown, and helps remove water from diesel fuel. It also contains extra lubricity and detergents to protect and clean the entire fuel system. It is safe for use in all diesel fuels including ULSD and bio-diesels and can be used in any diesel engine. Diesel Formula STA-BIL is available in a 32-once and gallon size.