![]() ![]() Other coolants without that symbol might meet the requirement but they have not been licensed to display that symbol. I believe that if a coolant displays the dexcool or DEX-COOL symbol, it means that the product has actually been licensed under that requirement (like dexos2 and dexosR for motor oils). It is correct that a manufacturer cannot specify a brand name, but a manufacturer can specify a standard that the coolant must meet. One needs to go by the Owner's Manual to determine which standards apply to the coolant required for a specific vehicle. In other words, there are lots of standards - some written by SAE, some by ASTM, and some by manufacturers (that is the GM DEX-COOL standard GMW3420). The different ASTM standards apply to different coolants with different requirements. For additional information on engine coolants see ASTM D 3306, ASTM D 5216, ASTM D 4985, and ASTM D 6210." In other words, the SAE web site reference several different ASTM standards - including the one above ASTM D 3306 which was invoked by the GM DEX-COOL standard GMW 3420. That web page also says "Engine coolant concentrate (antifreeze) must provide adequate corrosion protection, lower the freezing point, and raise the boiling point of the engine coolant. The latest one appears to be J814_202305 dated dated May 2023. The second clip attached is from an SAE web page and describes an "information report" as a "source of information concerning the basic properties of engine coolants which are satisfactory for use in internal combustion engines". GMW 3420 is a GM "specification for Ethylene Glycol Based Extended Life Automotive Coolant DEX-COOL." In accordance with this standard (see attached clip) "this extended life coolant concentrate is intended to be mixed with clean, potable water per the recommended limits specified in ASTM D3306."ĪSTM D3306 is a specification set forth by "ASTM International, a globally recognized leader in the development of voluntary consensus standards for engine coolants used in light duty service applications." Although, one standard may invoke another. I believe that GM Standard GMW 3420 is a GMW (General Motors Worldwide) written specification for coolant - not the same as SAE (Society of Automotive Engineers) standard and not the same as ASTM (American Society for Testing and Materials) standards.
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