I may have not been clear, when I said first, second and third I was referring to the dates, not the order of the samples. That would make 0w20 AFE on 7/30/17, 0w40 on 2/1/18, and 0w30 AFE on 9/24/18.
For wear I was looking at the 12ppm iron for 0w20 vs the 13ppm iron for the 0w40 with over...