Here is something interesting.
Ford released this
I have been reading that in Europe, 5W-20 is not put in cars delivered in Europe, whether Crysler or Ram or ford etc, As for Fords vehicles all have other viscosity like 5W-30 and 40 when delivered to Europe, Actually, you presently can't get 5W-20 in Europe unless specially ordered.
Now If you read the article, it about Ford developing with BP corp a new 5W-20 oil that will be compliant with Europe Europe's ACEA C2 oil sequence which does not have North Americas ver of the 5W-20 as being compliant.
Whats interesting in the article, Ford is quoted saying ""My key deliverable was that it offer no compromise on engine durability," to me its as if this new 5W-20 would not compromise engine durability like the North American Ver. Just my thoughts.