I have a 2022 Mazda MX-5 on the way, this year for Mexico the recommended weight moved from 5w-30 to 10w-30 for temps of 0f and above, the US 0w-20 is not recommended. here in the high dessert we get 115f summers and by next winter I should have moved south to basically Mexico weather. Going to start it on a diet of 10w-30 and stick with it for the forseeable future. I guess these days 10w-30 is considered "Thicc"
Obviously I am looking for low wear and engine cleanliness but additionally The 2.0l Skyactive G is a GDI engine with no fuel washing the backs of the intake valves. examinations of in service engines has shown that deposits do accumulate on the intake valves, there is healthy debate about weather these deposits will eventally cause drivability issues or weather they reach a stable state and stop accumulating, but either way lower the volitility of the oil the batter,
Many seam to like Molly in these engines, but both of the recommended sources with high molly, Idemitsu and Toyota motor guard, have poor NOACK ratings so a bit contradictory.
I ran Mobil one for a long time, recently I have been using PUP, both have worked well for me in UOA's in other motors. I tend to stick with mainstream oils but would consider a harder to source boutique oil if there was a solid reason to go to it.
One oddity about 10w-30 weights is across several brands they don't seam to get many approvals other than some ancient domestic specifications, is this just because of the viscosity? or is there something more to this? in this aplication no specific approvals are required other than the obvious:
Mexico:
US: