1998 Buick Century Owner's Manual - Page 140

Change Oil Soon Light Your CHANGE OIL SOON light should come on as a bulb check when you start the engine. Security Light This light will come on when you turn the key to START and stay on until the vehicle starts. I CHANGE OIL SOON If this light stays on for about20 seconds after you turn on the ignition, have the oil changed. When to change your oil alsodepends on driving habits and conditions because they directly affect engine speed, coolant temperature and vehicle speed.Because of this, the CHANGE OILSOON light may come on as early as 2,000 miles (3,200 k ) less for m or harsh conditions. Also see "Maintenance Schedule'' inthe Index for further instructions on when to change your oil. To reset the CHANGE OIL SOON light, see "CHANGE OIL SOON Light, How to Reset" in the Index. Also, see "Oil Life Monitor" in the Index. SECURITY It will also flash if your ignition key is too dirty or wet for the PASS-Key I1 system to read the resistor pellet. See "Pass-Key II" in the Index. If the resistor pellet is damaged or missing, the light will come on. If you're ever drivingand the SECURITY light comes on, you will be ableto restart your engine if you turn it off. Your PASS-Key 11 system, however, is not working properly and must be serviced by your dealer. Your vehicle is not protected by the PASS-Key I1 system. 2-64