1993 Buick Park Avenue Owner's Manual - Page 127

"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. Thiswill cause the "Change Oil Soon" light once again, to be lit for just the bulbcheck period of three seconds. CHANGE OIL SOON This is determined by electronically monitoring engine speed, coolant temperature vehicle speed. Since and the change interval is dependent upon driving habits and conditions, the "Change Soon" light may come on as Oil early as 2,000 miles or less for harsh conditions. The "Change Oil Soon" light is lit for three seconds as a bulb check each time theignition key is turned to the RUN position. If an oil change is required, it will stay on for 60 seconds each time 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 go off. This indicatesthat the Oil Life Monitor System has been reset.