Prolong Super Lubricants offers its Fast Fuel Diesel Fuel Treatment to improve mileage and performance in diesel engines. Prolong’s Diesel Fuel Treatment is formulated with premium detergents that clean injectors and the entire fuel system by removing gum, deposits and sludge build-up, to deliver better fuel economy and decrease the amount of black smoke. The formula meets Cummins L-10 diesel fuel additive specifications for injector cleanliness and Cummins N-14 diesel fuel additive specifications for corrosion protection with low and high sulfur levels. In addition, the product helps maintain diesel emission compliance and protect against corrosion and premature pump and injector wear. To use, pour Diesel Fuel Treatment into the vehicle’s fuel tank before fill-up. One 12 oz. bottle treats 16-20 gallons of fuel.