Reset service light indicator, engine oil life Cadillac Fleetwood, year 1991-1996 reset instructions:

1991-1992

Turn the ignition to run (one position before starting engine).
Press RANGE and FUEL USED simultaneously to display oil life index.
Press RANGE and RESET simultaneously until the CHANGE OIL SOON light flashes (hold about 5 seconds).
The oil life index will not remain displayed.
Turn the ignition off and then start the engine to verify the indicator has been reset.

1993

Turn the ignition to run (one position before starting engine).
Reset the Engine Oil Life Index by pressing the RANGE and RESET keys on the Fuel Data Centre for 5 to 60 seconds.
Release the keys. The indicator will automatically reset to 100. The CHANGE OIL SOON light will flash 4 times to indicate it has been reset to 100.
Turn the ignition off and then start the engine to verify the indicator has been reset.

1994-1996

Turn the ignition to run (one position before starting engine).
Immediately after Step 1 press and release the gas pedal 3 times within 5 seconds.
If the CHANGE OIL SOON indicator flashes, the system is reset (if this does not happen, repeat steps).
Turn the ignition off and then start the engine to verify the indicator has been reset.