1.1本规范涵盖了重型发动机冷却系统用低硅酸盐乙二醇基发动机冷却液的要求。当浓缩液在水中以40%至60%的体积浓度使用时，或当使用预稀释的乙二醇基发动机冷却液（最小50%体积）而无需进一步稀释时，它们将有效起到防腐作用，冻结至-37 o C（-34） o F） ，并沸腾至至少108 o C（226 o F） 。 注1——本规范基于对由新成分或原始成分制备的发动机冷却液性能的了解。 重型发动机冷却液有单独的规格（D6210和D6211），可以用回收或再处理的旧冷却液或再处理的工业来源乙二醇制备。 1.2符合本规范的冷却液需要初始加注补充冷却液添加剂（SCA），并需要定期维护SCA剂量，以在某些运行的重型发动机冷却系统中继续提供保护，特别是在缸体设计中的湿式缸套中。SCA添加由发动机制造商或车辆制造商定义，并由其承担主要责任。 如果他们没有提供说明，请遵循SCA供应商建议的说明。 1.3以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 This specification covers the requirements for low silicate ethylene glycol base engine coolants for cooling systems of heavy-duty engines. When concentrates are used at 40 to 60 % concentration by volume in water, or when prediluted glycol base engine coolants (50 volume % minimum) are used without further dilution, they will function effectively to provide protection against corrosion, freezing to at least -37 o C (-34 o F), and boiling to at least 108 o C (226 o F). Note 1--This specification is based on the knowledge of the performance of engine coolants prepared from new or virgin ingredients. Separate specifications exist (D6210 and D6211) for heavy-duty engine coolants which may be prepared from recycled or reprocessed used coolant or reprocessed industrial-source ethylene glycol. 1.2 Coolants meeting this specification require an initial charge of a supplemental coolant additive (SCA) and require regular maintenance doses of an SCA to continue the protection in certain operating heavy-duty engine cooling systems, particularly those of the wet cylinder liner-in-block design. The SCA additions are defined by and are the primary responsibility of the engine manufacturer or vehicle manufacturer. If they provide no instructions, follow the SCA supplier's recommended instructions. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.