Keep the engine and fuel system in your 2020-2023 Chevy/GMC 6.6L L5P Duramax clean with Fuel Additive. While additives are designed to enhance fuel system performance, other additives are available specifically for cold weather and to reduce fuel gelling while providing protection in the winter. Additives are formulated to provide your engine with what it needs to improve performance, reduce smoke, and clean engine and fuel system components. Shop today and find the additives you need for your vehicle from XDP, Lucas Oil, FPPF, Hot Shot's Secret, Stanadyne, and more!