Does the car spec full synthetic? I was under the impression Ford specs their Motorcraft Semi-synth for it.
That said, if you must use full synthetic, really any full synth on the shelf at WalMart should do the trick quite well. Quaker State, Valvoline, Pennzoil, Castrol.. They all are pretty darn good.
As far as the Oil Change Interval, I believe those cars have an IOLM.. just follow that.