I have about half a can of Ford Motorcraft 5W20 WSS-M2C945-A spec oil for my S197 GT 2008.
I couldn't find this type of spec, but doing some research shows it is superseded by WSS-M2C945-B1. (couldn't find this type of spec either).
So I bought Castrol Magnatec 5W-20 , oil spec wss-m2c948-b...