Nice UOA from this old dear.
I would imagine that these things typically shed metal at rates that would make a Honda owner blanch, and Blackstone seems to agree.
Also, kudos to you for being unafraid to use a grade that suits your climate.
These things probably called for 10W-30 but a 15W-40 HDEO is fine for the temperatures that you see.
From a cleaning point of view, though, this oil has only a normal PCMO dose of calcium and but a smidge of mag.