To reset the 2015 Cadillac CTS oil light, please follow these instructions:
1. Turn the ignition to run (one position before starting engine). 2. *Use the DIC controls on the right side of the steering wheel to display the REMAINING OIL LIFE. 3. Press SEL on the DIC controls. 4. Hold SEL down for a few seconds to reset the oil life to 100%. 5. Turn the ignition off and start the engine to verify the indicator has been reset. *Remaining oil life can also be reset by depressing the gas pedal 3 times within 5 seconds instead of using the DIC.