STP, 20 OZ, Diesel Fuel Treatment & Injector Cleaner, Treats Up To 35 Gallons, Fights Injector & Pump Wear, Formulated To Help Prevent Deposit Build Up & Corrosion In Diesel Engines, Fight Fuel Line Freeze & Wax Gel Formation, Fight Injector & Pump Wear By Improving The Lubricity Of Diesel Fuel.