We generally discourage the use of B-12 Chemtool in diesel fuel due to its highly volatile formulation. The flash point of this product is extremely low and may contribute to aggressive pre-ignition. We recommend our line of diesel additives. These products include an all-season formula, All Season Diesel Fuel Treatment (#0512), which treats up to 30 gallons of diesel fuel in all seasonal conditions. This product is available in a 12 oz. bottle for a quick one-tank application. When used according to label directions, this product will enhance lubricity, fuel stability, moisture dispersion, injector cleaning and retardation of wax platelets in the fuel to -40°F. We also offer Motor Tune-Up (#0316), Diesel Injector Cleaner (#0518), and Diesel Cetane Booster (#0517).