My 2 cents.
There has been enough concern over Dexcool that I would stay away from it, if possible, and that don't necessarily mean using the green.
GM had three engines that are noted for gasket problems, 3.0, 3.4, & 3.8. Ford had two, 3.0 & 3.8. The latter being much worse. When they added the 24 valve 3.0 a lot of cracked heads became an issue. I've seen a lot of GM 3.8 with blown gaskets and I had a 3.0 that blew gaskets twice in 150K. I used the orange in several Ford 3.0 without trouble, all having over 150K when they departed me.
But, in all of them I noticed this crud/sludge forming in resevoir and used several flushes trying to get it out. On one I removed the bottle and put oven cleaner in it after trying several solvents and soaps. That apparently broke it down enough to wash out with brake cleaner.
I don't know where this stuff hangs up in system, but I'm sure I don't want it. I was about to flush an Aurora, but traded. Damn stuff was all over the resovoir and suspect it gunked up radiator because I was having cooling issues in summer. I've read through some of the class action and there is no doubt some of the claims are bogus, but still many have validity. I have seen pictures of eaten up head gaskets. Whether it was because of dis-similar metals and or the Dexcool acting as an electrolyte or acid could be debateable. The problem makes lawyers rich and trouble for the consumer. GM and all just need to fix the problem and it should not take years to do it.
The main reason you change oil and antifreeze is because of the contaminants that accumulate, not that the main components wear out. Oil has additives for anti-oxidation and detergent and others. Quite a few do-it-yourselfers foolishly used racing oil thinking it was better. It has nearly no additives and is purer oil, but designed to run one race and then be drained, maybe 500 miles. And they also often tear down engines between races.
So, what did they add to the orange that would greatly extend its life? If you look closely at specs on green, it should be changed every year! One of the big components was rust inhibitors. Far less iron in the system these days. I looked at some GM specs a few years back and I found the permissible seepage alarmingly high. Just as blow-by gasses deteriorate oil, so does seepage of it into coolant damage it. A few years back, you could find a Prestone recharge on shelves for the DexCool. It was to be added yearly, but it did not sell and got removed from shelves. It probably had a small amount of lubricant, but mostly acid neutralizers and anti-oxidants.