Thanks everyone for their input. So I certainly learned a lot, especially that M1 0w-40 with high calcium and high sulfate ash could be an issue in DI engines. Originally I was just concerned about NOACK volatility with M1 0W-40 being very low at 6.2.
I like the idea of carving out the VW and just running 5W-30 across all the other vehicles - based on the bias toward Castrol I guess Edge 5W-30 would fit the bill, being an API SN+ oil? Thoughts on going this route?
Side note - I have run at least one OC with M1 0W-40 in the following:
Ford Expedition Ecoboost V6 - the truck ran much "smoother" then with the PPU 5W-30 that I normally would use - I was impressed with how much of a difference there was - 5k OCI's
RAM 1500 - V6 - the truck ran about the same with no noticeable difference from the factory fill (with the purchase of the truck I had a couple of free dealer oil changes) - 5k OCI's
Honda Ridgeline V6 - the truck ran a lot quieter over ZEPRO Eco Medalist Advanced Moly 0W-20 Engine Oil - this is a daily driver that sees about 100 miles a day in very heavy stop and go driving - I follow the Honda maintenance indicator
VW Jetta - No noticeable difference from the factory fill - the Jetta gets 5k OCI, each 5K miles I rotate doing an OC then taking it to the dealer so the oil change is documented for the 7 year warranty
Ford Edge 2.0 Ecoboost - the SUV has only had PP 5W-30 run in it - 5k OCI's
Nissan Titan XD - I have only used ZEPRO Eco Medalist Advanced Moly 0W-20 Engine Oil - 5k OCI's
Mazda2 - This simple engine has over 200k miles on it and has run many different brands of synthetic oil and many different viscosities, this is a world car for Mazda with sales over 500,000 units - I think engine would run on cooking to Texas crude! - 7.5k OCI's