Description:

Valvoline’s ZEREX™ Pre-Charged Heavy Duty antifreeze coolant is a complete ethylene glycol based formulation specifically designed for heavy duty diesel engines. The formulation is fully-formulated with specific chemical inhibitors to protect diesel engines from liner pitting and hard water scale deposits. The patented* inhibitor chemistry protects all cooling system metals from corrosion including aluminum. ZEREX™ Pre-Charged Heavy Duty can be used in gasoline engines and passenger cars as well. The ASTM test data shown on this sheet reflects the high performance corrosion inhibitor package.
When diluted 50% with water, ZEREX™ Pre-Charged Heavy Duty protects modern engines from winter freezing and summer boil over. The chart at the top right provides mixing information. Clean tap water or demineralized water is recommended for dilution. A 40% to 70% concentration range is suggested for optimum corrosion protection.
ZEREX™ Pre-Charged Heavy Duty is compatible with major American brands of ethylene glycol based coolant. It contains a high quality defoamer and will not harm gaskets, hoses, plastics or original vehicle finishes.

ZEREX™ Pre-Charged Heavy Duty is a universal engine coolant that meets the performance requirements of ASTM specification D3306 for automobiles and light trucks and D6210 for heavy duty engines. It meets the low silicate formulation requirements of GM6038 and contains less than 250 parts per million of silicate as required by the heavy duty trucking industry.