Thanks for chosing the ATS package. You can use either the Chrysler +3 or +4 fluid, or Amsoil. The warranty has everyone do the full transmission service at either 1 year or 15,000 miles (whichever comes first) and return the cooresponding paperwork each time to maintain coverage. This is why we recommend the +3, because it less expensive (but +4 is fine if you like to run that).