Storing diesel fuel for more than a year? Have a diesel storage tank to fill up your tractors or trucks? Make sure that fuel is staying fresh with STA-BIL Diesel Fuel Stabilizer. This fuel treatment will keep diesel fuel fresh for up to a year and prevents sludge and sediment from forming in your tank. The additive package in this formula cleans and lubricates fuel injectors and pumps and protects against corrosion. Diesel fuel can oxidize due to thermal breakdown very quickly. This formulation protects the fuel from oxidation and removes water. The treat rate of this product is 1oz to 10 gallons of diesel fuel. It is best practice to add STA-BIL Diesel Fuel Stabilizer to the tank with fresh diesel fuel when at the pump. This is safe and recommended to be used at each and every fill up regardless of how often you will be using your diesel vehicle. Be sure to check out our entire line of STA-BIL diesel products made specifically for your diesel vehicles.