IF it is in the radio and not a seperate computer then you do the following: Go into the vehicle settings with the radio controls. With the key turned to ACC, hold DISP on the radio for about 6 seconds and it should go into settings mode. Press DISP until you see oil life in all caps, then use Prev. & Next to scroll to reset oil life mon., then push DISP again. you should here a beep and the display should read Done. Scroll to Exit and press DISP again.
This is part of the new Allison Prognostics. It's very similar to the oil life monitor on the new cars.
The way to clear the filter light after the filter is changed is to:
Turn the ignition on, but do not start the truck
Next move the shift selector in this sequence, N-D-N-D-N-R-N, do not stop the sequence for more than 3 seconds once you start.
This should turn off the filter light.
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