Actually you can get closer to 25K on between changes with that oil and filter. Same thing I've run in my 3 trucks and my oil analysis shows oil still good at 22K. I change mine every 25K. If you install the by-pass system you can get 60K between changes with the same oil.

 

I'm running Rotella T 5w-40 synthetic also and have been using it since my 1st oil change.

 

I do the amsoil
The mileage DD mentions is doable. I have also heard evidence of.