Zerex Fully Formulated 50/50 Prediluted Ready-to-Use Antifreeze/Coolant from Valvoline is a complete ethylene glycol-based formulation designed to meet the harsher demands of heavy-duty diesel engines such as Cummins, DDC, MACK, Navistar and Paccar. Not to mention, its considered a universal engine coolant that meets the low-silicate formulation required by the heavy-duty trucking industry. Its low-silicate formula is pre-charged with advanced chemical inhibitors to help extend the longevity of your engine by protecting internal parts from pitting, cavitation, corrosion and scale deposits while preventing freezing and boil-overs. Plus, it includes a high-quality defoamer, so it wont harm gaskets, hoses, plastics, or original vehicle finishes. Its guaranteed to perform for up to 3 years, 150,000 miles or 3,000 hours of operation 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.