Get the Coolant & Additive product you need when flushing the cooling system in your 1982-2000 Chevy/GMC 6.2L/6.5L Diesel. Full synthetic and conventional antifreeze with supplementary ingredients provide you with a service life from 150,000 and 750,000 miles. The additives available will reduce engine temperatures, minimize surface tension for more efficient cooling, prevent corrosion, and offer faster warm-ups. XDP offers Hot Shot's Secret, XDP, Lucas Oil, DEI, Royal Purple, Mishimoto, and Evans products.