Opticool Antifreeze Blue is a universal engine coolant, suitable for all year round usage. Opticool Antifreeze Blue is manufactured from pure monoethylene glycol, anti-corrosion additives and inhibitors. It has been specially formulated to be truly universal in its application. It provides a high degree of corrosion protection for all engine cooling systems whether they are predominantly of aluminium or ferrous construction. Opticool Antifreeze Blue employs established inhibitor technology and is nitrite, amine and phosphate (NAP) free and includes borate and silicate. Opticool Antifreeze Blue contains a bittering agent to prevent accidental consumption.