I have 2022 SuperDuty Ford with the 6.7 diesel and it actually runs their 10w-30 HD diesel oil, but the manual states in high temperature climates you can use a 15w-40. I use 15w-40 or 5w-40 in my other diesels, I've been using Valvoline Blue / Premium Blue because they sell it at Napa.
Edit: I was sort of wrong, the manual states 5w-40 for extreme use, and 15w-40 if you're running bio diesel, and otherwise just use 10w-30.
Edit: I was sort of wrong, the manual states 5w-40 for extreme use, and 15w-40 if you're running bio diesel, and otherwise just use 10w-30.