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Organic Acid Technology (OAT) is a long-life coolant (LLC) / extended-life coolant (ELC), widely used in Europe before its introduction in North America. OAT is usually EG. The generally recommended replacement interval is five years or 225,000 kilometres. Vehicle owners should always refer to the vehicle manufacturer’s recommendations for coolant type.Since the late 1980s, considerable research has been undertaken on the development of genuine long-life coolants, which form a molecular layer or barrier. Unlike the physical barrier formed in the use of traditional inorganic inhibitors, these molecular layers are formed by the OAT molecules lining up on the metal surface, due to very finely tuned behaviour in their polarity. These molecular layers exhibit the same effect, preventing the metal surfaces from coming into contact with the corrosive base fluid. When the molecular layer is periodically interrupted (say, from particles of debris in the cooling system), it automatically reforms from other temporarily unattached OAT molecules in the cooling system. In this way, the layer continually reforms and repairs itself, and therefore the fluid’s life is considerably extended.