Zerex Heavy Duty Antifreeze/Coolant, Ready to Use - 1gal (ZXPCRU1) A 40 percent to 70 percent concentration range is suggested for optimum corrosion protection Meets or exceeds the performance requirements of ASTM D 6210, D 3306, Cummins 3666286, Detroit Diesel 7SE298, Cummins 90T8-4, B, TMC of ATA RP-302B.and others Compatible with major American brands of ethylene glycol based coolant Meets the low silicate formulation requirements of GM 6038