I keyed on your post for 2 reasons -- I have a Rhoudim White / Parchment CX5 and Ive never seen another white / white since I picked it up ( its a 23 ) - Then I saw your inquiry on oil -- Thats a slippery question -- and Ive been back and forth on it - You sound pretty well educated on cars so this is just what I found-- In USA/ Canada rec is 0w-20 full syn ..which I use with the Moly from Mazda and do the oil changes myself - Then of course you see that all other 2.5NA engines world wide use
5W-30..and get this non-synthetic ! Also its the recommended oil for the Turbo 2.5 ? -- so more confusing --non-synthetic ? So some say that the emission / "cafe" regulations forced Mazda to use the 0w-20 in the USA- no proof of that however
--- ok- thats considered , and possible , but I went digging further to get actual data on if it delivers the same protection , on start up and provides the same fuel economy and lasts ? all the stuff -- IT appears that the 0W-20 not only protects better on start ups but delivers better fuel economy and engine protection/performance . I think that the 5W-30 is recommended in these other countries due to cost and availability-- its cheaper ...but thats a guess .
Toyota has new 2025 engines running on 0W-16 !
I found a reputable clip of Mobil 1 providing accurate testing data on these 2 specific oils head to head ! The only difference is the 5W-30 tested is full synthetic -- but the 0W-20 still provided better gas mileage and performance - protected as well or better ..and thats against the full syn 5W-30;
Im sticking with the rec 0W-20 as my current other Mazda from 2010 runs on 0W-20 and its over 150,000 miles and dosent burn a drop of oil and runs great- let me know if you decide to switch and why you decided to ,- They use a Corvette C8 NA engine with cylinder deactivation in the test so its a near identical engine to the Mazda with high compression ---so its only difference is dry sump and V8 vs inline4.
Will Thinner Oils Damage Your Engine?