It's normal to start burning oil. Iron was high rocketing, silicon was high too.
The OCI were greatly above both car manufacturer recommendations and oil manufacturer recommendations (M1 AFE is rated to 15K miles), especially the last two OCI.
Also, M1 AFE is not robust exceptional oil, most likely average oil. I wouldn't use it longer than 5–7.5K miles. You did double and triple that.
As stated before, it used to have a better base oil in the formulation and the UOA themselves appeared fine. We were less informed at the time on other factors though.
Remember, AFE 0w-20 had a good % of PAO before. The issue is simply piston deposits. The wear numbers are fine. Iron accumulates with miles.
And, again, this was my BIL’s vehicle not my own.
That said, I did run AFE out to almost 15k once, but swapped to M1 EP when AFE formulation changed.
Despite all of that, to your point, if the oil isn’t marketed as extended use then regardless of base oils it’s a gamble. We were using Blackstone Labs at the time as well and they do not track oxidation in their analysis.
My BIL’s vehicle most recently had a rate of 1 Qt consumption at 1,100 miles. This is while on VRP; jumping up from 2,500-3,000 miles per Qt.
We’re still learning and tracking each vehicle.
Looking back, I’d say the insolubles creeping up is about the only thing those Blackstone reports gave us that indicated something was going wrong with the length of the interval. Pretty much all other results fall into a normal category; Si reading is low maybe you are seeing the Boron?
PS: I wouldn’t call oil burning that developed after or with an exceptionally long OCI as “normal” and in our situations, most likely it’s a function of running said intervals too long. A sudden spike in consumption is a simple observation that can indicate the oil has been in service too long. Maybe that’s what you meant?