2001 Buick Regal Owner's Manual - Page 146

Low Oil Level Light Your engine is equipped with an oil level monitoring system. When the ignition key is turned on, the LOW OIL light will come on briefly. If the light does not come on briefly, have it fixed so it will be ready to warn you if there's a problem. If the light stays on, stop the vehicle on a level surface and turn the engine off. Check the oil level using the engine oil dipstick. (See "Engine Oil" in the Index.) If the light does not come on briefly, have the low oil level sensor system repaired so it will be ready to warn you if there's a problem. The oil level monitoring system only checks oil level during the brief period between key on and engine crank. It does not monitor engine oil level when the engine is running. Additionally, an oil level check is only performed if the engine has been turned off for a considerable period of time, allowing the oil normally in circulation to drain back into the oil pan. Change Oil Soon Light The CHANGE OIL SOON light should come on briefly as a bulb check when you start the engine. If the light doesn't come on, have it serviced. If the CHANGE OIL SOON light comes on and stays on after you start the engine, have the oil changed. For additional information, see "Engine Oil, When to Change" in the Index. To reset the CHANGE OIL SOON light, see "Oil Life System" in the Index. 2-77