DCA4 Supplemental Coolant Additive (SCA) provides superior engine protection in heavy duty diesel applications where glycol based coolants are used, as well as marine and railroad diesel applications where water is used as the coolant. Benefits: Provides Improved Cylinder Liner Pitting Protection Provides Improved Aluminum and Solder Protection Less Tendency to Form Gel in Cooling System Improved Tolerance to SCA Under- or Over-charging Phosphate Buffers Are Less Likely to Cause Water Pump Leakage