Did mine at 15k and I am sticking to 30k intervals as well with Amsoil MTF. Much better shifting and it doesn't fall off as quick like the stock fluid did. I overfilled mine through the shifter tower by a quart and noted better shifting as well. Here is a copy of my uoa report. I will be doing another change soon.

 

I guess I'm on the 40K tran fluid change program now.......................




I am not satisfied with the shifting now that I filled 'er up with REDLINE MTL. I may have been expecting WAY to much ease by using REDLINE, but it is definately worse than the DC fluid from the factory. Even with the ~1 extra qt added it did not make the shifting any easier. I'm going to try something else as soon as the weather gets warmer, just haven't decided yet..........