PM Heavy Duty Antifreeze/Coolant Nitrite-Free Extended Life Red 50/50 is a premium quality Organic Acid Technology (OAT) ethylene glycol-based fluid. Specially formulated with industry-leading additives, this product provides up to 1,000,000 miles of extended service maintenance protection in heavy duty applications without the addition of SCAs and meets the nitrite-free coolant requirements of many industry-leading OEMs.