Reset service light indicator, engine oil life Buick LeSabre, year 1991-2005 reset instructions:

1. Turn the ignition to run (one position before starting engine).
2. Use a paperclip to push and hold the RESET button for 5 seconds. The CHANGE OIL SOON indicator
flashes to indicate the system is reset.
3. Turn the ignition off and start the engine to verify the indicator has been reset.
*The RESET button is under the passenger side glove compartment.