[Richard and Rhonda]

I am not going to try to condense what is in these two excellent reference articles direct from Detriot Diesel. Happy reading.
http://www.ddcsn.com/cps/rde/xbcr/dd...C-BRO-0002.pdf
http://www.detroitdiesel.com/Support...int_93K217.asp

And Wyn, I don't think you did any damage if the the coolant used with the rebuild had the right additive package. It's a decent assumption that a shop with enough know how to build the engine knew enough to put the right coolant in it.

Again, all of the coolants are ethylene glycol, regardless of color. There are different additive packages used to protect the diesel engine. The manufacturers dyed the coolants different colors to hopefully prevent mixing of additive packages.

Clarke, many of the truck shops are stocking only Power Cool Plus. It's an extended life version of Power Cool. Power Cool was the original nitrate additive package and Power Cool Plus is the new Organic Acid package. They are not truly mix and match.