Yahoo Message Number: 55405 (http://groups.yahoo.com/neo/groups/Country-Coach-Owners/conversations/messages/55405)
What is recomended for ISL400?
Fleetguard DCA4 coolant additive is an SCA principally composed of nitrite, molybdate, phosphate and silicate. To address the issues with operating high levels of DCA2-type SCA, Fleetguard introduced DCA4 with reduced levels of nitrite, substitution of phosphate for borate, and reduced silicate levels. By this, we reduced the aggressiveness of high levels of DCA2 on lead solder and aluminum. It is safe to run DCA4 as high as 5.0 units per gallon without fear of corrosion issues or water pump seal leakage.