Hey, that car does not take just any fluid. It uses the AWF21 transmission which takes the same fluid that Toyota uses. the
ATF T-IV. (can't remember the exact wording, ATF T-IV), Ford and Lincoln also sell this fluid under the Motorcraft name. Called something like "Motorcraft Premium Automatic Transmission Fluid."
Do not let your oil guy use the regular GM (Dexron) or Ford (Mercon) fluid, adding some kind of stuff to convert it to the correct fluid. Use the correct fluid in the first place. The correct fluid does not cost that much.
If you must go with a synthetic, I've used Wolfs Head Universal Synthetic ATF which works fine, and is not expensive.
Again, don't use Dextron or Mercon, even with the "special" additive. Use the correct fluid.