Engine Oil Level/Change Engine Oil
WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The instrument panel cluster (IPC) displays the Engine Oil Level/Change Engine Oil indicator when the PCM/ECM determines that the engine oil life is less than 5 percent. The PCM/ECM sends a class 2 message to the IPC requesting the display of the indicator. After the oil is changed, reset the engine oil monitor. Refer to GM Oil Life System - Resetting in Maintenance and Lubrication.