WOW!!! didnt know-Dex cool sucked!!
Didnt know-all this 411 regarding Dex Cool. In MM&FF they stated thats what to be used, I guess-It was wrong information.
But from what i have heard, You cannot mix regualr anti-freeze with Dex Cool, and you would have to properly flush the block and all its components thoroughly before putting the orange dex-cool in.
A friend of mine lived in Arizona, went off-roading all the time, in the desert with blaz'N temps... and had an aluminum rad, Black magic electric fan and used Dex Cool and 2 bottles of water wetter with a 160 Therm-and He claimed the thing never ran a hair over 170. He never had any problems with Dex-cool either. but hey-I guess every situaltion is different.
Anthony