The pedal method is to reset the oil change light when it comes on. The light comes on based on time, mileage, and sensor settings from the engine. My first light came on after 6900 miles. The next time it took 10,300 miles to light up. If you've got the system that that's flexible vs one that's based on mileage/time there is no way to change the settings, except maybe by reprogramming the computers.
I am not sure that you can reprogram the oil change interval.
Mine says "flexible" too and although I have messed around with the infotainment system, I have yet to find a way to set it to my own preference.
But the pedal method did work to reset the warning light so I am thankful for that, but it still says flexible on the screen. :|