I just went through this ordeal and want to stay with 5w40 if for no other reason that it has worked ok for the last 14 years. I ended up with Motul from here
https://www.rallysportdirect.com/part/engine-oil/mou-102051-motul-8100-x-clean-engine-oil-5w40-5l. If you magnify the front of the bottle picture you can barely make out the 229.51 approval, and it's a comparatively good price.
The reason for the lower viscosities is to let the manufacturers claim more mpg. We're down to 0w16 in some cars this year.