As long as it is synthetic, wouldn't worry about grade. Stick with full synthetic oil. Nevada, does it get warm there?
I also wouldn't extend the intervals. Definitely consider an early filter change.
Why synthetic?
Just curious.
Dealership runs *Shield Choice 0w20 here.
so... Motorcraft Synblend 0w20
I'm running *Ultraclean 0w20 in an XD, another synblend.
*Pennzoil Gold and *QS Synblend 0w20 sometimes exists.
Havoline has a HM synblend 0w20 out there.
*All these Oil Companies websites say these oils are compatible with the Titan and Titan XD 5.6
Im sure there are plenty of V8s are out there with timing chains and are filled with any of the above, living their lives to the fullest.
OP shouldn't have any issues with any of those oils. An API-rated 0w20 synblend isn't going to harm a thing. Enjoy the truck, change its oil every 6mo/5k miles.
Edit: and yes OP, thats what makes these trucks great.
No cylinder deactivation, No rev limits, No Start Stop, they just run.
I average 16.5mpg on 87, I averaged 18.5 on 89 in my previous 2018 Ram 1500 5.7
The only thing I dislike is the lack of an LSD.
Which I would suggest doing soon as well, the OEM stuff is dank and ugh,
fwiw Nissan 75w90 is ridiculously priced