MotorKote MK-10301-06-6PK Low Sulfur Lubricant, 16-Ounce, 6-Pack Directions: Add about 1 ounce per 5 gallon of diesel fuel every 3rd to 4th fill-up on most passenger vehicles; larger engines use same amount every fill-up It neutralizes inconsistencies in the fuel while lubricating the fuel pump and upper cylinder walls with Motorkote hyper lubricant making it un necessary to add oil to your fuel It returns your engine safely to pre low sulfur fuel running conditions without changing emissions or harming vital engine components Motorkote low sulfur lube will not void warranties Does not harm catalytic converters or oxygen sensors For Diesel Engines Only