If you are going to spend that much to import Castrol's 5W-50 "supercar" oil, why not consider Amsoil's 5W-50? It is made for the Ford spec specifically, and if you buy through one of the site sponsors here I'm sure you could get a bit better price to try it out. The reason I mention this is that my retired friend that owns one of these cars swears by this Amsoil in his heavily modified Ford "supercar". He tried the MC oil and said it was shot in a couple thousand miles in his car based on UOA.