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...
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