Check the codes by turning the key on and of 3x and leaving it on the last time. Watch the odometer. it should show the code then say done. TO reset the Oil Change light, turn the key on (truck not running), push the accelerator pedal to the floor 3x then turn the key off.
It may be a turbo code due to the Silencer Ring removal
It may be a turbo code due to the Silencer Ring removal