Get the Coolant & Additive product you need when flushing the cooling system in your 2003-2010 Chevy/GMC Kodiak/TopKick 6.6L Duramax. You'll find full synthetic and conventional antifreeze with supplemental additives that offer 150,000 to 750,000-mile service life. These additives will minimize surface tension for more efficient cooling, prevent corrosion, offer faster warm-ups, and reduce engine temperatures. Evans, Hot Shot's Secret, XDP, Lucas Oil, DEI, Royal Purple, and Mishimoto are just some of the top manufacturers available at XDP.