Which coolant do i use ????

[06T200]

On both of our 06's I flushed out ALL of the dexcool, and refilled them with the typical 50/50 water and green glycol based coolant.

I did this for a couple reasons, 1 - It was easy, 2 - I have had nothing but problems in the past with dexcool in my GM rigs, including needing head gaskets (95 Beretta, 92 Corsica) and new water pumps (99 GMC Sonoma, twice! and an 03 Malibu), on the second water pump on my GMC I got wise and used normal green coolant as I ran out of dexcool, and I had read nasty rumors about the red stuff around 2004. Sure enough that second pump ran for years with ethylene glycol before I wound up selling the truck. I have never looked back, and I have about 3 gallons of the dexcool crap in my shop as people give me the stuff for free as they don't want it. I refuse to use it at all, and never plan to. Run dexcool as long as you need for warranty purposes, then get it out of the engine and stick to the green stuff (ethylene glycol), it apparently is better on bearings and gaskets from my experience. Just my 02.