The synthetic Motorcraft oil for the GT is a special order item at most dealers and lists for $9+ a quart. Does anyone know who makes the oil for Ford under the Motorcraft name. I doubt if Ford has their own refineries.
Here is a good paper on the basics of oil and lubrication. It be somewhat technical, however I feel that the info is very sound and should be of interest to many.
Ford motorcraft does make 5w 50 full synthetic oil. It is designed and made for specifically for the Ford GT. Its even printed on the back label of a bottle of it.
Being a hybrid it needs 0W, somehow logic. The combustion engine is more often in low temperature on off cycles, only supplementing the electromotor. Hence it needs to have full lub right away. Don't think of putting that into a GT engine. Gets much hotter and needs to avoid lub film breakup, that happens with 0W oil at temp peaks. That's why you don't find something like 0W 60, physics. With 5W you already have pretty good lubrication, even at fairly cold engine. Best to look for the oil pressure. Once viscosity builds up, the oil press goes down under load, then you can accelerate harder,but I guess we all know that. So let me just shut up here...