Our OEM Extended Life Antifreeze/Coolant is an Organic Acid Technology (OAT) engine coolant. It is an engine coolant that is based on fully neutralized organic acid corrosion inhibitors. These corrosion inhibitors last longer than traditional corrosion inhibitors, and this is why OAT coolants are typically long life products. These coolants do not contain phosphates, borates, silicates, etc.