I mean, motorcraft ain't gonna put something out there if they don't recommend it. Lol
The xsp? That's what I just got. Oreilly has a sale. And Chevron has a rebate online.
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Last oil change I bought, which has been a few months was Chevron Delo LE 5w-40. I think that has been superseded with the new oil spec. I buy whatever Delo 5w-40 that walmart has on the shelf.... First I used was the Delo 400, then the 400 LE, and the next change will probably be the 400 XSP. Delo is a decent, lower cost synthetic. My 6.0 seems to like it.... and it is what I have used the longest in mine. I used the Motorcraft 15w-40 at first, then 1 change of the Valvoline Blue (The one with the big C on it), then Delo. I've been using Delo for at least 5 years...... (I've had the 6.0 of just over 11 years now........) As old as the 6.0 is (technology wise), I don't get hung up on the "letter of the latest spec".... a decent oil, like Delo is, and change it every 5,000 miles, and you should be good...., now if I had just spent 70 grand on a new aluminum wrapped 6.7, you better believe it's going to get the exact correct oil. The IDI, on the other hand, if it is 15w-40 and slick, it will do..... hell, right now, it has about half the capacity of straight 30 weight that I use in my Kohlers.......