32oz Diesel Fuel Supplement +Cetane Boost Formula is choice for optimal winter operation. Diesel Fuel Supplement +Cetane Boost contains the most effective antigel additive package available in the diesel industry - no blending with No 1 diesel or kerosene is needed to achieve maximum winter protection. Diesel Fuel Supplement +Cetane Boost keeps fuel injectors clean and boosts cetane up to 4-numbers for faster cold starts and a smoother running engine. Although Diesel Fuel Supplement +Cetane Boost is an antigel, it will not harm your engine to use year-around. Treats up to 100 Gallons. 32oz bottle.