Seems 2018 Toyotas, maybe Lexuses are factory filled to spec 0W-16. I wonder when and if Toyota would certify this to work in our engines. Or if they don't, to go ahead and do it anyway. In theory it shouldn't cause a problem. Of course brands will start having to formulate this to get it on US shelves for the same price as 0-20 or no point in using it for the negligible (but still present) fuel savings.

https://noln.net/2017/06/30/skinny-ow-16-oil/

I hear even 0W-8 is in the works.