With Expertise Built In™, OTR Heavy Duty Extended Life Antifreeze/Coolant Concentrate has first-rate wet sleeve liner cavitation protection and contains a molybdate and nitrite additive mixture. This heavy duty antifreeze/coolant boasts comprehensive service maintenance protection for engines that require a heavy duty Nitrite Organic Acid Technology (NOAT) coolant. FleetPride is your First Click in Heavy Duty®.