If you want to turn the oil change required light off just turn the key to the one position (but don't start the truck) and pump the accelerator pedal 3 times in quick succession. That will turn the light off.
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'08 QC SB 4WD G56/3.42, Leveled, Thuren Track Bar, SSSSS, 325/70R17 Nittos, Ride Rites, PMT, Shaved BlueTec Badge 