Keep the engine and fuel system in your 2003-2004 Dodge 5.9L Diesel clean with Fuel Additive. Additives are formulated to provide your engine with what it needs to improve performance, reduce smoke, and clean engine and fuel system components. In addition to additives that enhance lubricity and cetane, other additives are designed specifically for cold weather and to reduce fuel gelling and provide winter protection. Get all the additives you need for your vehicle from XDP, FPPF, Lucas Oil, Hot Shot's Secret, Stanadyne, and more!