Thanks again for the additional replies. Yes, sadly, the vast majority of this cars driving will be short trips well under 30 minutes. No doubt the 0W20 would be the totally logical choice overall. -and I will certainly be doing frequent oil changes for several reasons, not the least of which is to combat possible fuel dilution, crankcase condensation, possible corrosion and whatever other bad stuff occurs due to the cold weather short trips.
I still may consider using a xW30 during our few warmer months of the year, likely from April to October, just to give me a little more hot-viscosity wear protection for our occasional summer trips up the mountains, and the potential 2 or 3 hour freeway trip. I do have some Mobil 1 0W30, API Service SP, which I think I should use this summer, and then go back to the 0W20 for winter again. After that, for the following summer months, heck I might just as well use 5W30 just as our Impala and GMC use. Honestly, it would be nice to have all three vehicles using the same oil.
So, it looks like the bottom line remains, just as many of you have already stated, either 0W20 or 5W30 will work just fine.
AND whatever I do, I will always make sure it has a very high film strength test, no matter what flavor I choose.
I have actually found it difficult to even find 0W30 anywhere in our town, which may be a good reason to forget that one.
I will be glad to see the Gen3 licensed oils released, possibly later this year? -seems like the date is still not certain.
In the meantime, I will use oil with API Service SP, for this reason, as quoted from the api.org website: "
"Category "SP"-- designed to provide protection against low speed pre-ignition (LSPI), timing chain wear protection, improved high
temperature deposit protection for pistons and turbochargers, and more stringent sludge and varnish control."
Again thanks to all for helping me brainstorm this topic !!