The GMC Sierra has a feature that displays an Oil Life Remaining percentage that helps you know when to change your oil. For example, if “REMAINING OIL LIFE 80%” is displayed, that means 80% of the current oil life remains.
Once the Remaining Oil Life hits a low percentage, a message that says “CHANGE ENGINE OIL SOON” will be displayed. Once you have had maintenance service performed on the truck, you can perform an oil reset using these steps.