Zerex Heavy Duty Extended Life Antifreeze/Coolant from Valvoline is formulated to meet the harsher demands of heavy-duty diesel engines such as Cummins, DDC, MACK, Navistar, Paccar and Volvo. It can also be used in gasoline engines, stationary power, marine, natural gas and light duty applications. Our Organic Acid Technology (OAT) is charged with special inhibitors to help extend the longevity of your engine by protecting internal parts from pitting, cavitation, corrosion and hard-water scale deposits. Developed with the highest-quality virgin ethylene glycol, its able to prevent freezes and boil-overs. And its guaranteed to perform for up to 3 years, 300,000 miles or 7,000 hours of operation with no supplemental coolant additives required when used in conformity with package and label instructions and specifications. When it comes to protecting and prolonging the performance of your heavy-duty engine, trust Zerex for the long haul.