Not until after the warranty.Amsoil 5W40. Make sure to get the Amsoil EA filter as well. You get extended drain intervals, the Amsoil warranty and an engine that will thrive with full synthetic oil.
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AmSoil marketing at it's best. :doh: "Hey buddy, if you use my stuff, when Ford denies your warranty claim, I'll take care of repairing your 20k engine...." Yeah, right. Not a bet I want to take.
Ford calls for 15w40 or 5w40 for any content BioFuel or severe use. Unless you are up north, you are fine with any single rated 15w40 CK-4, or dual rated CJ-4/SM. The difference in oils between the major brands are so small, any difference in wear or engine cleanliness, performance, etc., is negligible. Frankly, Shell and Ford worked together some to get CK-4 Rotella good to go, so that's a strong choice. Personally, I run Valvoline Premium Blue, CJ-4, 15w40.
The ford approved list is here: https://www.fcsdchemicalsandlubricants.com/main/additionalinfo/dieseloilsWSSM2C171F1.pdf
AmS multi-level-marketing-oil ain't on it.
Why does everyone swallow the pill that makes them think AmSoil has technology or magic that the majors don't?