2004 coolant
#4
I don't think it's an issue with the 5.3. I have a 2000 5.3 with dexcool. Had it flushed two years ago, and replaced with dexcool. I think the problem was the 5.7 plastic turkey tray in the intake, plastic gaskets, what next.......... I hope someone with more experience can confirm this.
#6
They say dexcool is the only thing you are supposed to put in the GMs especially because with having the aluminum block the regular coolant will cause corrosion. I would not use anything else other than dexcool.