Buick 1998 Century Owner's Manual page 140

Change Oil Soon Light
I
Your CHANGE OIL SOON
light should come on as a
CHANGE OIL
bulb check when you start
SOON
the engine.
Security Light
This light will come on
when you turn the key to
START and stay on until the
SECURITY
vehicle starts.
If this light stays on for about 20 seconds after you turn
on the ignition, have the oil changed.
When to change your oil also depends on driving habits
and conditions because they 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 (3,200 k m )
or less for harsh conditions.
Also see "Maintenance Schedule'' in the 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.
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 driving and the SECURITY light comes
on, you will be able to 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.
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