Well, I would honestly use Mobil 1 but it is just too expensive when I can use the Esso XD3 which has an amazing additive pack and real robust TBN that I need in my climates.
I understand what you are saying, but even German Castrol has the same relative viscocity as the XD3 and it is perfectly fine as well.
I would go lighter, but my engine has over 135,000miles on it and I don't want to go too thin.
I just want a reasonably priced PAO synthetic oil to allow my truck to last as long as possible.
I just honestly cant see the point to going to Mobil 1 and get a weaker additive package at a higher price.
I have the ability to buy it so I might as well take advantage of it. So many people in the US would love to be able to buy it.
Also, I doubt it will be made in 0w20 seeing XD3 synthetic is a heavy duty oil targeted towards heavy machinery use rather than standard vehicles. Not saying it can't be used though. I love the stuff.