Not all coolants are made the same. Choosing the right coolant, tested and proven to meet industry standards, is essential to the long term protection of an engine cooling system. Valvoline works closely with the world’s leading vehicle manufacturers to understand the requirements of today’s engine technology. Valvoline ZEREX™ and heavy duty coolants include those with Automaker Approved Chemistry™, which means the coolant chemistry is the same as specified by the manufacturer. The result is a comprehensive range of fully formulated products with approved chemistries by many leading OEMs, providing the very best in engine protection. Valvoline’s ZEREX and HD coolants are available in both organic acid technology (OAT) and hybrid organic acid technology (HOAT) formulations.