1995 Buick LeSabre Owner's Manual - Page 108

Change Oil Soon Light (Option) This light is activated by the Engine Oil Life Monitor System. The Engine Oil Life Monitor determinesthe condition of the engine oil and lets you know when the oil should be changed. See "Engine Oil" in the Index. RUN position. It will stay on for 60 seconds once 90% 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 and service is required. After changing the engine oil, the system should be reset. This will cause the CHANGE OILSOON light to be lit for a bulb check period of three seconds. CHANGE OIL SOON It does this by electronically receiving data from the Powertrain Control Module. The data it receives contains information about engine speed (revolutions per minute), coolant temperature and vehicle speed. The Engine Oil Life Monitor uses this data to determine how much the oil has degraded. 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 come on as early as 2,000 miles or less forharsh circumstances. 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. Thisindicates that the Oil Life Monitor System has been reset. SOON light is lit for five seconds as The CHANGE OIL a bulb check each time the ignition key is turned to the 2-52