1.1 This specification covers the requirements for fully-formulated glycerin base coolants for cooling systems of heavy-duty engines. When concentrates are used at 40 to 60 % glycerin concentration by volume in water of suitable quality (s This specification covers the requirements for fully-formulated glycerin base coolants for cooling systems of heavy-duty engines. It also notes that the requirements of the coolant concentrate or prediluted coolant include protection in operating engin