Stanadyne Diesel Fuel Additive 1 gallon, protects your diesel engine & restores engine performance, restores/increase 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 ultra-low sulfur diesel fuel, can be used with bio diesel fuel up to B20