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Coolant meets tough Cummins, Cat specs
Zerex Extreme Extended Life antifreeze/coolant from Valvoline is reported to be the only product that meets the Cummins CES 14603 spec and the Caterpillar EC-1 spec for heavy-duty applications without the need for supplemental silicate additives at first fill. Because it is compatible with other brands of ethylene glycol-based coolants, it can be used for mixed fleets with gasoline engines. It also