That Toyota UR is a great engine. I'm sure you're on top of it, but I'd be very aggressive with the coolant changes every 50k. People are seeing some head gasket issues in engines without proper coolant changes.5.7L v8
Tundra is very easy on oil.
Also I don't need 0W in my area and 10W is very adequate.
I try to go one notch higher than the owner's manual recommendation or spec. I have also seen many good reports with M1 EP and Valvoline EP 5W-30 has UOAs comparable to Amsoil.
My own experience with M1 EP 10W-30 has been very good also. It doesn't burn in any of our cars. That's the only approval I care about.I don't care how many approvals an oil carries, If it burns, game over.
For example M1 FS 0W-40 burned in the only car I tried and in a week or two I'm trying M1 5W-40 (with the same Euro approvals) in the same car to see what's going on ... And this car didn't burn any oil with other oils that I've tried including M1 EP 10W-30, Havoline PRO DS 5W-30, Kirkland 5W-30, Castrol Euro 0W-40, and in older days, Chevron Supreme 5/10W-30, Castrol GTX Magnatec 5/10W-30.
It also burned oil with another full synthetic 5W-30 multiple times but I am not going to mention the brand. I am a M1 fan so I feel like it's not a real criticism but FS 0W-40 is like a family member I'm staying away for now. Lol
If you are looking for a good Euro oil, lately I have been buying bunch of Castrol Edge Euro Car 5W-30 on sale gor $24.xx/5qt with the following approvals:
A3/B4, BMW LL-01, MB 229.5/229.3, VW 505 00/502 00
Exceeds API SL.
Price per approval is very good.
Agree on approval = not burning oil!

I'm still trying to figure out the significance of the Euro approvals. Appreciate all the recs.
Thank you for the advice. Definitely leaning towards at least the 4 full OCIs on VRP.You know my adventures well from my oil burner thread. As you also know my thoughts have changed on using any synthetic oil at 5k mile oci’s. The Valvoline R&P 5w30 will work great in both vehicles and clean up if needed and keep things clean. You’re definitely severe service so keep oci’s 5k or under. ESP 0w30 is my current oil in everything and would also work great. It has very stringent approvals that concentrate on wear, sludge, oxidative thickening, and deposits.
As far a boutique's, probably in my next new car. Not sure it would benefit you in your circumstances.
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Coldest starts for me probably in the single digits in the mountains. Doubt I'd get below 0 but possible. Fortunately those days are behind me! Previously would have some -20F starts.I'd just do 5w30 VRP in each in shortish OCIs.
It's cheap enough you aren't breaking the bank to run short OCIs. It seems (in my experience) like it can clean up even 18 year old engines full of varnish.
If you had truly cold starts, I'd suggest running a couple OCIs of VRP and switching to ESP 0w-30. But if you don't need the 0w (and few of us do), then the 5w30 VRP is the easy button.