How to Reset the Oil Life on a Cadillac CT6

1. Using the DIC buttons, display REMAINING OIL LIFE on the Driver Information Center.
2. Press and hold SEL to clear the CHANGE ENGINE OIL SOON message and reset the oil life at 100%.
3. Check that the CHANGE ENGINE OIL SOON message is off, which shows the system is reset.
4. If the message returns when the vehicle is started, repeat the procedure.

• Only reset the oil life right after the oil is changed; it cannot be reset accurately until the next oil change.
• The manual also gives an alternate method: with REMAINING OIL LIFE displayed, fully press and release the accelerator pedal three times within five seconds.

Source: 2020 Cadillac CT6 owner's manual, PDF page 282. Steps are summarized in our own words (AI-assisted, checked against the cited pages 2026-10-18). Other model years can differ; your manual has the final word.