LRSA specifies Castrol Magnatec A1 Professional 5w30, and that's what I use, only because there is no other oil conforming to the Ford  WSS-M2C-913C spec for the Puma engine.
However, there have been reports from a couple of users that their dealers used other oils. One reported Castrol SLX Professional 5W30 and another one reported   Mobil 1 0W40, neither of which conform to WSS-M2C-913C.
Find the best oil you can buy that conforms to WSS-M2C-913C. AFAIK, there is a Penrite 5w40 that conforms to WSS-M2C-913B, that should do it 

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