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Do not use a commercial coolant/antifreeze that only meets the ASTM "D3306" specification. This type of coolant/antifreeze is made for light duty automotive applications.Use only the coolant/antifreeze that is recommended.
Caterpillar recommends a 1:1 mixture of properly inhibited distilled or deionized water and glycol. This mixture will provide optimum heavy-duty performance as a coolant/antifreeze.Note: Cat DEAC does not require a treatment with an SCA at the initial fill. However, a commercial heavy-duty coolant/antifreeze that only meets "ASTM D4985", by specification, WILL require a treatment with an SCA at the initial fill. A commercial heavy-duty coolant/antifreeze that meets the "ASTM D6210" specification WILL NOT require a treatment with an SCA at the initial fill. Read the label or the instructions that are provided by the manufacturer of the commercial heavy-duty coolant/antifreeze.Note: When adding SCA at initial fill to a coolant/antifreeze that only meets the "ASTM D4985", ensure the SCA is compatible with the antifreeze/coolant. For example, a HOAT coolant that meets the "ASTM D4985" specification may not be compatible with an SCA designed for use with conventional coolants. It is the responsibility of the coolant manufacturer to provide sources of compatible SCAs. It is the responsibility of the coolant manufacturer and SCA manufacturer to demonstrate a positive influence on reducing cavitation corrosion in an operating diesel engine.Note: These coolants WILL require a treatment with a supplemental coolant additive on a maintenance basis.Note: When adding SCA at initial fill to a coolant/antifreeze that only meets the "ASTM D4985", it is a collective responsibility of the user, coolant manufacturer, and SCA manufacturer to ensure the SCA is compatible with the antifreeze/coolant based on the recommendations provided by the coolant manufacturer and SCA manufacturer. One of the test methods required to be used to help ensure SCA compatibility with the antifreeze/coolant concentrate is "ASTM D5828-97". 6% SCA in the solution that is 60 parts antifreeze/coolant of interest, 34 parts water, and 6 parts SCA must have no more than 0.1 mL of formed insolubles. 12% SCA in a solution that is 60 parts antifreeze/coolant of interest, 28 parts water, and 12 parts SCA must have no more than 2 mL of formed insolubles. The SCA manufacturer is responsible for ensuring their SCA is compatible with water meeting the "Caterpillar Minimum Acceptable Water Quality Requirements" as found in this Special Publication and as found in "ASTM D6210-06", Table X1.1.
All Cat diesel engines equipped with air-to-air aftercooling (ATAAC) require a minimum of 30 percent glycol in order to help prevent water pump cavitation.
Note: Refer to the engine Operation and Maintenance Manual for exceptions.
Table 1
Service Life Before Flushing and Before Refilling    
Coolant     Service Life (1) (2) (3)    
Cat ELC     965,606 kilometers (600,000 miles)
12000 hours
6 years (4)    
Commercial coolant that meets the Caterpillar EC-1 specification    
482,803 kilometers (300,000 miles)
6000 hours
6 years (5)    
Cat DEAC    
321,869 kilometers (200,000 miles)
3000 hours
3 years    
Commercial Heavy-Duty Coolant/Antifreeze that meets "ASTM D4985" or "ASTM D6210"    
241,402 kilometers (150,000 miles)
3000 hours
1 year