Originally Posted by James1549

Sometimes a manufacturer will recommend a particular product to be or sound more environmentally friendly. That doesn't mean the regular stuff will cause damage and can work as well.

I have been through this with Saturn years ago when they specified a particular antifreeze.
Turns out in the end the dealer was using just the regular green stuff.

GM recommends Dexcool. The first thing I do if I buy a used GM is dump that crap out, flush, and refill the green. Ask others what problems Dexcool can do but GM recommends it.