Call Ford and ask. If they spec 5W20, they want 5W20, not 0W30!!! PERIOD. What Amsoil says is all fine and dandy, would you gamble with a $30,000 vehicle because Amsoil says they'll get your back? I guess you would you sell the stuff.
Remember SSO doesn't wear the API Starburst, so they can say they meet any spec they want. But they don't have the API stamp on SSO. Ford would like to see that too. The dealer has the right to refuse a claim if the oil they spec wasn't used. Try adding Type F trans fluid to a new GM car see what happens if you have a tranny problem. I mean after all it is tranny fluid isn't it? Only problem, it isn't what GM calls for. Same for SSO in a Ford or Chrysler calling for an API approved 5W20.
If I use the correct oil I don't have to send Amsoil to refresh anyone. After warranty have at it.......