1997 Buick LeSabre Owner's Manual - Page 130

When to change your oil depends on driving habits and conditions because these directly affect engine speed, coolant temperature and vehicle speed. Because of this, the CHANGE OIL SOON light may turn on as early as 2,000 miles (3 218 km) or lessfor harsh circumstances. The CHANGE OIL SOON light is lit for five seconds as abulb check each time the ignition key is turned to the RUN position. It will stay on for 60 seconds once 90 percent of the oil life has been used and each time the engine is started after that. If the CHANGE OIL SOON light is on continuously, there is a problem with the Oil Life Monitor System service is required. and After changing the engine oil, the system should he reset. This will cause the CHANGE OIL SOON light to be lit for a bulb check period of three seconds. The reset button is in the glove box. With the ignition key in the RUN position, push the reset button, hold it in for at least five seconds but not more than 60 seconds. After five seconds, the CHANGE OIL SOON light will flash four times and then go off. This indicates that the Oil Life Monitor System has been reset. 2-70