The following was copied from the 2009 Ford Service manual.
Again I will ask how your mechanic was able to determine that the oil was last changed at 114000 miles and had 16000 miles on it since last changed. The below information does not give mileage totals between oil changes.
SECTION 413-01: Instrumentation, Message Center, and Warning Chimes 2009 Expedition/Navigator Workshop Manual
GENERAL PROCEDURES Procedure revision date: 09/12/2008
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Message Center Configuration
Oil Life Reset — Message Center Cluster
NOTE: The oil life calculation is set at a maximum of approximately 12,070 km (7,500 miles) or 180 days.
NOTE: The XX's in the message center displays below represent a numeric value. For example, the message center may display OIL LIFE = 80%.
Press and release the SETUP button until the message center displays OIL LIFE = ***% HOLD RESET = NEW.
Press and hold the RESET button for 2 seconds and release when the message center displays OIL LIFE SET TO 100%.
Press and release the SETUP button to exit the procedure.
Oil Life Reset — Base Instrument Cluster (IC)
NOTE: All message center functions are carried out using the single stem reset button in the Instrument Cluster (IC).
NOTE: The oil life calculation is set at a maximum of approximately 12,070 km (7,500 miles) or 180 days.
NOTE: The XX's in the message center displays below represent a numeric value. For example, the message center may display OIL LIFE = 80%.
Press and release the reset button to scroll through the information displays until the message center displays HOLD RESET FOR SETUP MENU.
Press and hold the reset button for approximately 2 seconds until the message center displays HOLD RESET FOR SYSTEM CHECK.
Press and release the reset button until the message center displays OIL LIFE = ***% HOLD RESET = NEW.
Press and hold the RESET button for 2 seconds and release when the message center displays OIL LIFE SET TO 100%.
Press and release the reset button to exit the procedure.
Oil Life Start Value — Message Center Cluster
NOTE: The oil life start value is used to increase or decrease the starting point of the oil life. The value can be changed back to the maximum of approximately 12,070 km (7,500 miles) if the value was previously changed or lowered by 10% increments down to 10%.
NOTE: The XX's in the message center displays below represent a numeric value. For example, the message center may display OIL LIFE = 80%.
Press and release the SETUP button until the message center displays OIL LIFE = ***% HOLD RESET = NEW.
Press and hold the RESET button for 2 seconds and release when the message center displays OIL LIFE SET TO 100%.
NOTE: The oil life start value can be lowered from 100% to 10% in 10% increments then the value starts again at 100%.
Press the RESET button once for each 10% reduction below the default 100% until the message center displays OIL LIFE SET TO XX%.
Press and release the SETUP button to exit the procedure.
Oil Life Start Value — Base Instrument Cluster (IC)
NOTE: All message center functions are carried out using the single stem reset button in the Instrument Cluster (IC).
NOTE: The oil life start value is used to increase or decrease the starting point of the oil life. The value can be changed back to the maximum of approximately 12,070 km (7,500 miles) if the value was previously changed or lowered by 10% increments down to 10%.
Press and release the reset button to scroll through the information displays until the message center displays HOLD RESET FOR SETUP MENU.
Press and hold the reset button for approximately 2 seconds until the message center displays HOLD RESET FOR SYSTEM CHECK.
Press and release the reset button until the message center displays OIL LIFE = ***% HOLD RESET = NEW.
Press and hold the RESET button for 2 seconds and release when the message center displays OIL LIFE SET TO 100%.
Press the RESET button to lower 10% from the default 100% until the message center displays OIL LIFE SET TO XX%.
NOTE: The oil life start value can be lowered from 100% to 10% in 10% increments then the value starts again at 100%.
Repeat steps 2-5 for each desired 10% reduction.
Press and release the reset button to exit the procedure.