After a good flush you can fill it with either Fleetrite or CAT ELC that requires no additives/checking. Plan on spending about $9 a gallon and get 8.
As far as the anti ELC info, I have used both Rotella ELC -in my '90 IDI that went 300k+ mi and CAT ELC in my PSD that is knocking at 300k mi with no coolant/cavitation related issues
I agree with the 203 stat

the PSD's seem to like the slightly higher operating temps.
just my couple pennies
