Oil change to 5w30 was due to towing and heat here in Texas. Just not comfortable with 0w20 looks like water. Also it is an economy of scale thing the other two automobiles take 5w30 so I only have to buy the one type of oil for changes. I still like to change my own oil and rotate my tires.Sounds like you take good care of it! Why the oil change? Also did you notice a difference with the trans fluid? Did you drain the pan and refill or do a flush?
The trans fluid replace was also due to towing. So for month or so I was on pins and needle with trans fluid replace. I had dealer do this work and it was total fluid replace however they chose to do it. I would have to look at paper work to see what option they picked. Overall I would say truck seems to shift better after fluid replace. My driving style is pretty laid back from stop light to stop light. What I do however do a lot of is hwy mile at 80+. With and without boat in tow. I tow in 6th per manual. I average about 16.5 mpg for most all my daily normal and road trip driving. I get about 11 pulling the boat.
I plan to do the diffs and transfer case again at 125k that will be 50K on those fluids as opposed to 75k I did on factory install. I will do coolant and transmission again at 150k. I also plan on radiator, water pump, etc... at that 150k.