If it's only one month old there's really no need to change the oil unless you've already done 10,000 miles in it. For the future though, if it's bone stock I wouldn't worry about changing to heavier oil or anything. Just run the recommended weight and type which I believe is still semi-synthetic or full synthetic 5w20. You can run the motocraft oil or if you want you can get something else of the same or higher quality. I'd recommend Amsoil, Mobil 1, Royal Purple, Castrol (Some hate it, but I've never seen any problems), or Valvoline (Again some hate it).