Dura Lube HL-44001-12-12PK Upper Cylinder Lubricant, 5.25-Ounce, 12-Pack Directions: Add full contents to fuel tank every fill-up; work in gas, diesel and flex fuels; use in auto, truck, marine, farm, industrial, lawn and garden, 2 and 4 cycle engines Reduces carbon buildup Helps prevent pre-ignition, burned valves and broken rings Restores lost power, cleans, lubricates carburetors, injectors and valve seats Improves acceleration and helps eliminate valve sticking