Change Engine Oil - Chevrolet 1999 Silverado 1500 Pickup Owner's Manual

CHANGE ENGINE OIL

When you change the engine oil, be sure to reset the
Engine Oil Life Monitor. See "Engine Oil, When to
Change" in the Index.
SECURITY
If the security message is displayed continuously while
driving and stays on, there may be a problem with the
Passlock System. Your vehicle will not be protected by
Passlock, and you should see your GM dealer.
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This message is displayed
when the engine oil needs
to be changed. The message
is only displayed for
15 seconds at the start
of each ignition cycle.
This message is
displayed when the
-
content theft deterrent
system has been activated
and also monitors the
R
Passlock System.
SERVICE 4WD (If Equipped)
Malfunctions can be indicated by the system before any
problem is apparent, which may prevent serious damage
to the vehicle. This system is also designed to assist
your service technician in correctly diagnosing
a malfunction.
If the SERVICE 4WD
message comes on, there
may be a problem with the
Automatic Transfer Case
and service is required.
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