This specification covers the requirements for fully formulated glycol base engine coolants intended for use in the cooling systems of heavy-duty engines. The coolants governed by this specification are categorized as follows: propanediol base concentrate and prediluted propanediol. The coolants shall provide protection in operating engines against cavitation corrosion (also termed as liner pitting) and internal engine hot surface scaling. Hot surfaces typically are within the engine head, head spacer, upper cylinder liner, or liquid cooled exhaust manifold. Both the concentrated and prediluted coolants shall meet the sulfate ion content requirement.

1.1 This specification covers the requirements for fully-formulated glycol base coolants for cooling systems of heavy-duty engines. When concentrates are used at 40 to 60 % PDO concentration by volume in water of suitable quality, (see Appendix X1), or when prediluted PDO base engine coolants (50 volume % minimum) are used without further dilution, they will function effectively during both winter and summer to provide protection against corrosion, cavitation, freezing, and boiling.

1.2 The coolants governed by this specification are categorized as follows:

Coolant Type

Description

I-FF

1,3 Propanediol base concentrate

II-FF

1,3 Propanediol predilute (50 vol %)

1.3 Coolant concentrates meeting this specification do not require any addition of Supplemental Coolant Additive (SCA) until the first maintenance interval when a maintenance dose of SCA is required to continue protection in certain 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 instructions.

1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.5 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.