Make adding Fuel Additive to your 2007.5-2010 Chevy/GMC 6.6L LMM Duramax a routine during every fill-up. 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. Fuel additives are specially formulated to provide your engine with better performance, less smoke, and clean engine and fuel system components. Find the additives you need in your vehicle from the top brands like FPPF, Hot Shot's Secret, Lucas Oil, XDP, and more!