REV X Distance + Diesel Fuel Additive - 16 oz. Treats 400 Gallons Concentrated! Treats up to 400 Gallons of Diesel Fuel. Includes Built In Measuring Compartment. Just squeeze the bottle and Pour in measured amount. Increases Engine Performance & Fuel Efficiency with Minimum 8 Cetane Point Increase. Improved Cold Starting In All Diesel Engines. Increases Detergent and Lubrication Properties to Clean Entire Fuel System. Reduces Exhaust Emissions and Toxic Smoke.