This is a next generation OAT extended life, Nitrite free heavy duty ethylene glycol engine coolant concentrate. OAT Antifreeze/coolant concentrate is an extended life ethylene glycol coolant for heavy duty diesel, gasoline and natural gas powered engines. It contains OAT corrosion inhibitor technology that provides effective corrosion protection of engine and cooling system metals. The product is free of nitrites, amines, borates and silicates, it is pre-diluted and suitable for both heavy and light duty applications making it ideal for use in mixed fleet. It requires no further dilution.