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This is how you do it for a 1990.
Turn key to 'on' but don't start car.
Press ENG MET button on the Trip Monitor and release. Then within 5 seconds
press and release ENG MET button again
WIthin 5 seconds of step 2, press and hold Range button on the trip
The change Oil Light will flash
Hold the range button until Change Oil light stops
On a 94, you hit the eng/met....eng/met...then press and hold the "gauges" buttons. There are similar subtle differences between models. What year are you asking about?