Long time lurker...First time poster.
Interesting fact with this, otherwise, unremarkable, first UOA...The 0.75qt that I added as makeup oil was Mobil 1 5W-30, and was literally less than a week before I decided to change the oil and have it analyzed.
I have read plenty about high iron as a byproduct of Mobil 1 5W-30...Could it be that the M1 high iron condition manifest itself over the last ~200 miles of a 5,000 mile OCI???
It does not explain the hit the viscosity took...That is, more likel,y the Nissan (Infiniti) engine being tough on oil, I suppose.