1993 Buick LeSabre Owner's Manual - Page 116

"Change Oil Soon'' Light (Option) This light is activated by the Engine Oil Life Monitor System. It indicates that the engine oil has degraded enough to require changing. See "Engine Oil" in the Index. After changing the engine oil, the system should be reset. This will cause the "Change Oil Soon" light once again, tobe lit for just the bulb check period of 3 seconds. I This is determined by electronically monitoring engine speed, coolanttemperature and vehicle speed. Sincethe change interval is dependent on driving habits and conditions, the "Change Oil Soon" light may come on as early as 2,000 miles or less for harsh circumstances. The "Change Oil Soon" light is lit for three seconds as a bulb check eachtime the ignition key is turned to the RUN position. If an oil change is required, it will stay on for 60 seconds eachtime the engine is started. If the "Change Oil Soon" light is on continuously, there is a problem with the Oil Life Monitor System and service is required. The reset button is inside this hole, which is under the passenger's side of the instrument panel, near the door. With the ignition key in the RUN position, but the engine not started, use a pen to push the reset button, holding it in for at least 5 seconds but not more than 60 seconds. After 5 seconds, the "Change Oil Soon" light will flash 4 times and then turn off. This indicates that the Oil Life Monitor System has been reset. 1 l A