BAR 4963019 - Caterpillar

Water
Deionized water or distilled water is recommended for use in engine cooling systems. If distilled water or deionized water is not available, use water with the properties that are listed in Table 3.
Table 3
Caterpillar Minimum Acceptable Water Requirements
Property Maximum Limit ASTM Test
Chloride (Cl) 40 mg/L (2.4 gr per US gal) "D512", "D4327"
Sulfate (SO4) 100 mg/L (5.9 gr per US gal) "D516"
Total Hardness 170 mg/L (10 gr per US gal) "D1126"
Total Solids 340 mg/L (20 gr per US gal) "D1888"
Acidity pH of 5.5 to 9.0 "D1293"
Use of water that does not meet the recommendations for the cooling system will damage the cooling system.Do not use these types of water in the cooling system: sea water, softened water that has been conditioned with salt, hard water and tap water.Only use water that meets the recommendations for the cooling system.
If you are not sure about the properties of your water, consult one of the following sources for a water analysis:
Cat dealer
Local water utility company
Agricultural agent
Independent laboratoryGlycol
Do not use Extended Life Coolant (ELC) with Cat Gas Engines.ELC was not formulated for use in Cat Gas Engines.Do not use heat transfer fluids in Cat Gas Engines.Use only the coolant/antifreeze that is recommended.
Preferred - Cat Natural Gas Engine Coolant (NGEC)Alternatively, use Cat Diesel Engine Antifreeze/Coolant (DEAC) or a commercial heavy-duty coolant/antifreeze that meets "ASTM D6210" or "ASTM D4985" specifications.
Do not use a commercial coolant/antifreeze that only meets the ASTM "D3306" or equivalent specification. This type of coolant/antifreeze is made for light duty automotive applications.Use only the coolant/antifreeze that is recommended.
Acceptable - In applications that do not require protection from boiling or freezing, a mixture of Cat SCA and water. Using a mixture that meets the properties that are listed in Table 3 is acceptable.Note: The preferred coolant/antifreeze and the acceptable mixture of SCA and water require different concentrations of SCA. Refer to the Special Publication, SEBU6400, "Supplemental Coolant Additive (SCA)" topic.Table 4 is a list of the coolant/antifreeze that is recommended for Cat Gas Engines. The service life of the coolant/antifreeze that is used in Cat Gas Engines is also listed. To achieve this service life, the coolants must be maintained. The maintenance program includes S O S coolant analysis.
Table 4
Recommended Coolant/Antifreeze and Service Life of the Coolant/Antifreeze
Coolant/Antifreeze Service Life (1)
Cat NGEC Three Years
Cat DEAC
Commercial Heavy-Duty Coolant/Antifreeze that meets "ASTM D6210" Two Years
Commercial Heavy-Duty Coolant/Antifreeze that meets "ASTM D4985" One Year
Cat SCA and Water Two Years
Commercial SCA and Water One Year
(1) The service life of coolant is also limited by use (service hours). Refer to the specific engine Operation and Maintenance Manual, "Maintenance Interval Schedule".Additives
Preferred - Cat Supplemental Coolant Additive (SCA)Acceptable - A commercial SCA that provides 1200 mg/L (70 gr per US gal) or 1200 ppm of nitrites in the final mixture of coolant/antifreezeNote: A 50/50 concentration of Cat NGEC or of Cat DEAC does not require a