Yes, and there may be some confusion since the DT300i has four (4) odometers: ODO, TRIP 1, TRIP 2, and (blank) the oil service odometer. You gotta push the ADJ button and scroll though the odometers until you get to (blank) and THEN push both MODE & ADJ until that number goes to 0.0. Have fun!
Whodda thought, four odometers!