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Table 1
Recommendations for Finished Coolants for use in Cat engines
Coolant Type Recommendations Product Service hours (1)(2) Required Maintenance(3)
Cat ELC, Cat ELI, or commercial coolant that meets Cat EC-1 Preferred Cat ELC 12000 hours or 6 years Add Cat ELC Extender at 6000 service hours or one half of service life
Cat ELI (water based) (4) 12000 hours or 6 years Add Cat ELC Extender at 6000 service hours or one half of service life
Min requirements Cat EC-1 specification and "ASTM D6210" and
Organic Additive Technology (OAT) based on a combination of a monocarboxylic acid and a dicarboxylic acid
Phosphate, borate, and silicate free
Tolyltriazole: minimum typical concentration of 900 ppm
Nitrite: minimum typical concentration of 500 ppm in new coolants 6000 hours or 6 years Add Extender at 3000 service hours or one half of service life
Cat DEAC, Cat SCA, conventional coolants and commercial extended life coolants that do not meet EC-1 Acceptable Cat DEAC 3000 hours or 3 years SCA at maintenance intervals
Cat SCA (water based) (4) 3000 hours or 2 years SCA at maintenance intervals
Min requirements for fully formulated Heavy Duty Commercial coolants "ASTM D6210" and
Nitrite (as NO2) concentration: Minimum of 1200 ppm (70 grains/US gal) and maximum of 2400 ppm (140 grains/US gal)
Silicon concentration: minimum of 100 ppm and maximum of 275 ppm 3000 hours or 2 years SCA at maintenance intervals
Min requirements for Commercial coolants requiring SCA precharge "ASTM D4985" and (4)
Nitrite (as NO2) concentration: Minimum of 1200 ppm (70 grains/US gal) and maximum of 2400 ppm (140 grains/US gal)
Silicon concentration: minimum of 100 ppm and maximum of 275 ppm 3000 hours or 1 year SCA at initial fill and SCA at maintenance intervals
Min requirements for SCA and water(5) Commercial supplemental coolant additive and water having
Nitrite (as NO2) concentration: Minimum of 1200 ppm (70 grains/US gal) and maximum of 2400 ppm (140 grains/US gal)
Silicon concentration: minimum of 100 ppm and maximum of 275 ppm 3000 hours or 1 year Per manufacturer recommendations
(1) New Coolants at 50 volume percent diluted. Coolants that are prediluted at the coolant manufacturer must be diluted with water that meets Reagent 4 "ASTM D1193" requirements.
(2) Maintain the in-service coolant at the given limits.
(3) For appropriate maintenance procedures, refer to the details given in this Chapter. For applications that allow the use of Cat ELI in water, a minimum of 7.5 percent of Cat ELI is recommended. For applications that allow the use of SCA and water, a minimum of 6 percent to a maximum of 8 percent concentration of Cat SCA are recommended.
(4) Water-based coolants are not allowed for use in engines that have NOx reduction aftertreatment devices, in engines that have AATAC, and in marine engines that have SWAC. Water based coolants are glycol-free.
(5) There are currently no industry standards to define the quality of water-based conventional coolants. In order to control the quality of SCA and water coolants, the commercial SCA additive package should pass ASTM D6210 and/or ASTM D4985 when this package is used in a glycol based coolant. Do not use a commercial SCA additive package that only meets the ASTM D3306 or equivalent specification when used in a glycol based coolant.
Table 2
Special Requirements(1)
Cat 3618 engine model Water-ELI is recommended. Water-SCA is acceptable. Glycol-based coolants are NOT allowed.
(1) For freezing protection of −5° C (23° F) temperatures and lower, consult your Cat dealer for guidance.When referring to the Service Life in table 1, use the interval that occurs first. These coolant change intervals are only achievable with annual S O S Services Level 2 coolant sampling analysis.Refer to the engine Operation and Maintenance Manual for the correct interval for replacement of the cooling system water temperature regulator.Note: For engines that require a maximum of 20% glycol, make sure that the amount of additive in the final mix is appropriate. Example of mixing a 20% glycol solution is given in Table 3.
Table 3
Example of Mixing Up a 20% Glycol Coolant (1)
Total Volume of the Cooling System Add the Following:
ELC Concentrate ELI Concentrate Water
10 Gallons 2 Gallons 0.5 Gallons 7.5 Gallons
(1) Volumes can also be in liters as long as all the volume units are consistentExtended life coolants require the one time maintenance addition of an extender at coolant service mid-life. For commercial coolants, do NOT use an extender with a coolant unless the extender has been approved by the coolant manufacturer for use with the coolant. The coolant manufacturer is responsible to ensure compatibility and acceptable performance. Failure to follow these recommendations can result in shortened cooling system component life.Conventional coolants require the maintenance addition of SCA throughout the expected life. For commercial coolants, do NOT use an SCA unless approved by the coolant supplier for use with the coolant. The coolant manufacturer is responsible to ensure compatibility and acceptable performance."ASTM D4985" and "ASTM D6210" require coolants that are properly dosed with SCA and that are in a properly maintained cooling system in normal service to be suitable for use for a maximum of 1 year ("ASTM D4985") and 2 years ("ASTM D6210"). The suitability for use requirement is the direct responsibility of the coolant manufacturer and SCA manufacturer. Consult with the coolant and/or SCA manufactu