Well after reading some of the debates and research here on which is better, Amsoil or Mobil 1. I went to the Mobil website and nowhere was it stated that Mobil has the Ford License or approval, or any other auto manufacturers. So this blows the the warranty issues out the door. I did this because I want "the best" synthetic ATF for my 97 Infiniti Q45, with 56670 miles on it. I decided to try Mobil for this car. On the bottle it does not state that it's approved or license from any auto manfacturer. But, it does state recomended for use in GM, Ford,Chrysler and many imports. What I think it's all boils down to what actually works in the car itself. People here have given the impression that it has this advantage over Amsoil if the car is still under warrenty which is not true. Both companies make quality products it just depends on whom your car's tranny likes. Next year I'll be changing my 04 Mercury over to Amsoil. Or maybe Redline.