Here is my 2nd analysis on my '06 Infiniti M35X...Much better results for both iron and viscosity (although I would still like to see it a little lower on the iron), despite using the exact same oil for both samples.
Couple of comments I can't believe I forgot to mention when I posted the first analysis...
1. During the run for the first sample, I had my radiator fail with the expected increase in engine temperature...I caught it before the temperature spiked but it certainly ran significantly higher than normal for ~30-60 seconds...I suspect that could have resulted in some significant viscosity breakdown.
2. Also during the run for the first sample, I was less "diligent" about keeping up with makeup oil...I was more of a hawk during the run for the second sample...As I doubt the car got that much "thirstier" in the last 5,500 miles, I am pretty sure I was running way low on oil. This may also tie into their comment on the high volume of makeup oil "diluting" the metals PPM readings.
Still not thrilled with the oil consumption, so my latest fill was Castrol 10W-40 High Mileage...We will see if the heavier weight has any impact.
As always, all comments and observations are welcome!