That engine looks to be spec'd for Chrysler MS-13340, which means you can either use the Chrysler 0W-30 oil or Pennzoil Platinum 5w-30 which carries the MS-13340 spec.
This^^^ Factory fill was probably Selenia Digitek 0w-30 which meets FIAT 9.55535-GS1. There is no direct read across equivalent for this in the domestic oil market so I believe that MS-13340 is sort of a bridge spec from FIAT spec to API. So... 13340 is what you want and Pennz Plat 5w-30 meets it. Says so right on the bottle.