1996 Buick LeSabre Owner's Manual - Page 121

Check Oil Level Light (Option) The CHECK OIL LEVEL light is lit for three seconds as a bulb check each time the ignitionkey is turned to the RUN position. If the light doesn'tcome on, have your vehicle serviced. Change Oil Soon Light ('Option) This light is activated by the Engine Oil Life Monitor System. The Engine Oil Life Monitor determines the condition of the engine oil and lets you know when the oil should be changed. See "Engine Oil" in the Index. CHECK OIL LEVEL CHANGE OIL SOON If the engine oilis more than one quart low, the light will come on briefly, then go off for 15-25 seconds, and then come back on for 20-40 seconds. However, the system will not registerlow engine oilif it has not been more than eight minutes since the engine was shut off. If the CHECK OIL LEVEL light comes back on, the engine oil shouldbe checked at the dipstick then brought up to the proper level necessary. See "Engine if Oil" in the Index. It does this by electronically receiving data from the Powertrain ControlModule. The data it receives contains information about enginespeed (revolutions per minute), coolant temperature vehicle speed. The and Engine Oil Life Monitor uses this data to determine how much the oil has degraded. 2-65