There is no problem using Dexcool in any GM car that specs it ( anymore ) the problems with gaskets were solved a long time ago, they simply made the gaskets they were using resistant to the 2-Eha Dexcool uses.
While most manufacturers have now switched to OAT / HOAT formulas, the formulas vary.
GM and Ford use OAT coolant with 2-Eha.
VW uses a Silicated "Si-OAT" with no 2-Eha
Chrysler uses a OAT with no 2-Eha.
And Asian manufacturers use Phosphated "P-OAT" coolant without 2-Eha.
So personally i wouldn't have a problem putting Dexcool in a Ford which has Ford's current Orange OAT coolant, but i would not put it in a VW, Chrysler or any Asian car, as their factory coolant do not use 2-Eha.
2-Eha does very nasty things in cooling systems not designed for it, swell rubber seals, hoses, gaskets, eating away at soldered radiators...