[afterburn 549]

I have studied this carefully and will tell you my take on it.
Looking at the oil ratings for temps thought to be operated in, is one answer.
Maybe is the biggest one.
Next- in my case, in other countries the 0W 20 oils are not used, same engine.
Here, the EPA has mandated a percentage better fuel economy and this has made auto stop /start engines appear.
The engine will automatically shut off at stop lights and restart. The thinner oils and auto start-stop engines deliver their 1.5% more required.
As for me ?
Yes I got rid of the 0W20 crap after the first 4000 miles and went full synthetic 5W30
Also, the Oil pour viscosity rating between 0W and 5W is almost negligible.
If you look at the brand of oil Called "Driven" they also list viscosity used for bearing application clearance.
The EPA does not give a rip about how long your engine might last, and the manufacturer is caught in the middle of the hoop jumping.
I for sure am NOT telling what to do, but what I did.
If I was living in the Desert I would be running 10W40 or maybe 50 In my B58