C8.3 Commercial Marine and Ind [...] Coolant Recommendations and Specifications Section V - Maintenance Specifications Page V-17 Cooling System Additives Supplemental Coolant Additive (SCA) Supplemental coolant additives (SCA) are recommended for all Cummins Inc. cooling systems. Antifreeze alone does not provide sufficient protection for heavy-duty diesel engines. DCA4 DCA4 is the recommended SCA for all Cummins Inc. engines. Other brands can be used if they provide adequate engine protection and do not cause seal or gasket degradation or corrosion/fouling. SCA Concentration The recommended concentration level of DCA4 is 1.5 units for every 3.7 liters [1 gal].
The DCA4 concentration must never exceed 3.0 units for every 3.7 liters [1 gal] nor fall below 1.2 units for every 3.7 liters [1 gal]. DCA4 Filter Change Interval Supplemental coolant additives deplete during normal engine operation. Cummins Inc. recommends that the level be maintained by installation of a service coolant filter on the engine at every 10,000-km [6214 mi], 250-hours, or 3-month interval. DCA4 Concentration Test As noted above, the primary method is to maintain proper DCA4 concentration levels by changing the service coolant filter at every 10,000 km [6214 mi], 250 hours, or 3 months. Fleetguard® DCA4 “dipstick” test kit, Part No. CC2626, or Fleetguard® Monitor C™, Part No.
CC2700, must be used if testing is deemed necessary due to one of the following reasons: Addition of untreated make-up coolant in excess of 5.7 liters [6 qt] between maintenance intervals Troubleshooting of cooling system problems in the fleet (such as corrosion or seal leakage) An optional program in some fleets to monitor SCA levels to determine if maintenance intervals are acceptable.