SUPPORT AS-ENGINE 1N4373 - Caterpillar

Table 7
Coolant Recommendations for Cat Diesel Engines    
Recommen-
dations     Product     Service Hours (1) (2) (3)     Required Maintenance    
Preferred     Cat ELC and Cat ELI     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    
Acceptable     Cat DEAC     3000 hours or 3 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(1)
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    
( 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 ) When referring to the service hours, use the interval that occurs first. These coolant change intervals are only achievable with annual S O S Services Level 2 coolant sampling analysis.
Use Only Approved SCAs and ExtendersConventional coolants require the maintenance addition of SCA throughout the expected life of the coolants. Do NOT use an SCA with a coolant unless approved specifically by the coolant supplier. The coolant manufacturer is responsible for ensuring compatibility and acceptable performance.To help ensure expected performance, EC-1 coolants require the one time maintenance addition of an extender at coolant service mid-life. Do not use an extender with a coolant unless the extender has been approved specifically for use by the coolant manufacturer. The coolant manufacturer is responsible for ensuring compatibility and acceptable performance.Failure to follow these recommendations can result in shortened cooling system component life.
Cat ELC can be recycled into conventional coolants.For more information, refer to Special Publication, SEBU385, "Cat Commercial Engine Fluids Recommendations".S O S Services Coolant Analysis
Testing the engine coolant is important to ensure that the engine is protected from internal cavitation and corrosion. The analysis also tests the ability of the coolant to protect the engine from boiling and freezing. S O S coolant analysis can be done at your Cat dealer. Cat S O S coolant