Well, it is time to change the coolant on my 2003 Monterey with the Cummins ISC 350. I plan to use the Fleetguard ES Complete OAT. This is the red coolant and does not require adding DCA. Has anyone used this, and if so did you flush with just water before filling with the new coolant? Also, I am trying to find out how many gallons to buy, and have not been able to find it anywhere. Anyone that knows the capacity would sure help.
Thanks,
Jim