Change Oil Soon
WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
The IPC illuminates the CHANGE OIL SOON indicator when the powertrain control module (PCM) determines that the engine oil should be changed. After the oil is changed, reset the engine oil monitor. Refer to OIL CHANGE REMINDER in Maintenance Reminder Light Reset Procedures.