1996 Buick Park Avenue Owner's Manual - Page 136

Change Oil Soon Light (Option) This light is activated by the Engine Oil Life Monitor System. The system determines the condition of the engine oil and lets you know when the oil should be changed. (See "Engine Oil" in the Index.) 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 OILSOON light may comeon as early as 2,000 miles or lessfor harsh conditions. The CHANGE OIL SOON light comes on for five seconds as a bulb check each the ignition key time is turned to the RUN position. It will stayon 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 Life Monitor System and Oil service is required. After changing theengine oil, the system should be reset. This will cause theCHANGE OIL SOON light to be lit again for the bulb check period of three seconds. CHANGE OIL SOON It does this by using information about engine speed (revolutions per minute), coolant temperature and vehicle speed. The system uses data to determine this how much the oil has degraded. 2-80