OTR Heavy Duty Extended Life Antifreeze/Coolant 50/50 Premix ensures Expertise Built In™, featuring extended service maintenance protection for engines that need a heavy duty Nitrite Organic Acid Technology (NOAT) coolant. This heavy duty antifreeze/coolant provides superior wet sleeve liner cavitation protection and includes a molybdate and nitrite additive mixture. FleetPride is your First Click in Heavy Duty®.