I agree with 500ho and Computer guy. Synthetic oils reduce friction so much that you won't get proper break-in wear. Personally, I would go to synthetic at 6,000 mi. and then only with a FORD synthetic if there is such a thing.
Until my warranty is up I have the Ford dealer do ALL maintenance. Here is why. First, as 500ho said Ford (like most manufacturers) is a stickler on warranty repairs. If you dealer does the repair and maintenance on your vehicle, they have little to argue with. Second, most ford dealers will update the most recent "flashes" to your cars computer and will automatically perform any recalls. NO Jiffy-lube can do that. Lastly, most Ford dealers charge about the same as you local oil change store.
I hope this helps.