Originally Posted by MustangInTexas View Post
I don't understand. Why would the "normal maintenance" call for something better than what one would expect on a TSB to fix an issue? seems jlbell4444 got it right. The TSB was written before the XL-18 was out. It still seems that the Transmission Fluid Chart would supersede the TSB instructions if you're changing out the transmission fluid. Why would you ever do a partial fix because the OLD instructions tell you to? One should not blindly follow instructions without a thought.
You should get this addressed by your service manager and our Tech Hotline, MustangInTexas.