Get the Coolant & Additive product you need when flushing the cooling system in your 2020 Chevy/GMC 3.0L Duramax. The additives available will reduce engine temperatures, minimize surface tension for more efficient cooling, prevent corrosion, and offer faster warm-ups. Many types are available such as fully synthetic and conventional with additional additives that provide your coolant with service life of 150,000 to 750,000 miles. Evans, Hot Shot's Secret, XDP, Lucas Oil, DEI, Royal Purple, and Mishimoto are just some of the top manufacturers available at XDP.