How to keep your engine in great condition and improve its performance? Use this additive that increases diesel cetane number by 7 points, which improves fuel economy and keeps the engine in good condition. It also provides additional lubrication to fuel system components including pumps and injectors, prevents rust and corrosion in the fuel line, removes moisture from the tank and adds stability to the fuel. All in all, this 16 oz. bottle is enough for more than one use.