Trop Artic is awesome if you have it available, it's near identical to the Motorcraft you have been using.
Any of the Dexos blends should also be at least as good as Motorcraft, Pennzoil Gold, Castrol Magnatech, Quaker State blend. Maxlife is an awesome blend too if the high mileage thing doesn't bother you, some people get stuck on it.
The mentioned PYB is likely as good or better as well.