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...
This is an interesting point for discussion. Daimler-Benz forever specified G-05, and the original cooling systems in my early 1980s vehicles make the case for its use.
But G-05 is no more on their approval list. G-48, BMW blue is. It lists 2-EHA as an ingredient, specifically the sodium salt (believe older fed forulations used a potassium salt, not certain though). So naturally I'm hesitant to use G-48 in those same 30+ year old cooling systems that G-05 has protected so well.
My thought is that G-40, which Daimler now specifies, might be a better move if it can be assured to have no eha. G-05 is likely still the best, especially when available at Napa for $12.99 for a full strength gallon at Napa on sale, currently.
But how G-40 plays in the G-05/48 comparability game is a question I have currently.