Stanadyne Diesel Fuel Additive 1 gallon, protects your diesel engine restores engine performance, restoresincrease horsepower, reduces fuel consumption, cetane improver, meets all engine fuel system requirements and will not harm exhaust aftertreatment systems, reduces emissions, clean protects, reduces wear, stabilizes fuel, cold weather protection, corrosion preventative, helps remove water, contains no alcohol, specially formulated for use with ultralow sulfur diesel fuel, can be used with bio diesel fuel up to B20