I use nothing but Rotella T Synthetic 5W-40 in all of my high performance vehicles.... The R1, the CRF450R, and the Trans Am ... its the best oil you can buy, and it can be had far cheaper than the comparables.... I would suggest it, but also wouldn't argue if you wanted to stick with the 5-w20 that Ford recommends

On the other hand, i use Mobil clean 5000 in the Harley truck... in a vehicle that's not beat on, i kinda think that as long as you change the oil faithfully and keep up with it, its not going to make a difference what oil you use... So i buy the clean 5000 b/c its SUPER cheap, made by a good name brand, and i change it @ 3000 miles faithfully.