A diagnostic scanner that reads OBD1 (the system by which your vehicle processes trouble codes) will be required, many parts stores do this a s a free service. Check with them to see if they charge. Remember though, when they read the car and turn the light off that in order for the light to stay off, the problem must be fixed. Even if it was a one time fluke of a problem, get the code that their scanner gives them so that you know what the issue is.
Oldsmobile
Bravada, Silhouette wI(DIC) Driver Information Center
With the
ignition key in RUN but the engine off, repeatedly push the
trip/reset button until “OIL” is displayed on the Driver Information
Center (DIC). Once “OIL” is displayed, push and hold the trip/reset
button for five seconds. The number will appear and be replaced by
100 (indicating 100% oil life remaining). Turn the key to OFF. If
the “CHANGE ENGINE OIL” message comes back on when you start your
vehicle, the engine oil life system has not reset. Repeat the
procedure.
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