So like many, what exactly is going on here with Ford and the specs. My old 6.0 is young at 74k miles. I used my last bit of Delvac ESP 5W40.
Is there any real reason to change? The Delvac 1 ESP 5w-40 may not be on the approved list at the moment (maybe never) but if your vehicle is out of warranty, there's no concern. The new Delvac 1 ESP 5w-40 is CK-4 only, not CK-4/SN, if that means anything to Ford or you.
NH73's point is well taken. Which other company out there besides Ford has gotten alarmed about CK-4? Delvac 1 LE 5w-30, a low phosphorus E6 lube, is on the approved "E" list for your vehicle, for that matter.