There's a chance that the extra lubricants from the manufacturing process are helpful for break in. That's what Honda says and they know a thing or two about gasoline engine durability. I doubt that Ford does anything materially different. Of course, you could always hedge your bets and change it at 5K miles. Whatever break-in benefit to the factory fill has taken place by then, probably.
The Ford IOLM works great. I know because I tested it on my 2012 on the 3.7L. The excellent Motorcraft oil sailed through the 5K mark, and when the IOLM finally went off at 8,300, it was still well within spec and had plenty of additive left. Merely, my short-haul driving habits had caused the acid build up to outrun the add pack. (which requires a certain amount of engine heating to do its job). But I still had plenty of powder dry so to speak in the add pack that had not been activated. I could have jumped in the car and driven a couple of thousand miles on the highway with nothing but benefit.
Some of the Eco-boost engines showed fuel dilution in the oil, which causes some people to change extra early, but that seems to have been solved now.
