REV-X Diesel Oil Additive & Fuel Kit - 4 oz Oil Treatment (2) + 8 oz Diesel Fuel System Cleaner Complete protection for oil and fuel system in diesel powered engine. Full system cleaner for both the oil and fuel system for all diesel powered engines. High Performance Oil Treatment: 8 fl. oz. will treat 12 quarts of oil. Distance+ Diesel Fuel Treatment: 8 fl. oz. will treat 200 gallons of diesel fuel. Hundreds of thousands of Customers cant be wrong, REV X works!