Tell you what, I have never had a problem with Dexcool. I have a '96 Olds with 120,000 and a Chevy with 115,000. Changed the coolant a few times at most. They never run hot, they especially don't run like the complaints that I read about after Googling. I suspect that the main problem is coming from air in the system or a radiator cap that is allowing the pressure to drop thus enabling the water to boil at a lower temperature. GM's are synonymous for faulty intake gaskets. If the pressure drops the car will run hot. My 2 cents.
