Here is my latest report. I wasn't happy with the iron levels (especially compared to other models with this engine) and decided to up the viscosity considering how I drive the truck, my climate location and my preference with the intervals. I drive it hard, no towing or heavy payloads but heavy/quick accelerations and about 80% highway driving. Pretty pleased with the results. Not sure about going to 12k as suggested but still happy with the results. At this oil change, I used just regular M1 5W-30 since it was readily available. I may switch it up to M1 0W-40 next go around. I'm not a fan of the 0W-20 that is spec'd for this engine and CAFE blah blah., fuel economy etc. Every oil tested before this was with 0W-20. Wish I had switched sooner. No telling what affects long term it may have caused but I guess better late than never. Probably overthinking all of this as most of us do but I'll sleep happier at night with a more robust oil.