Lincoln 2013 MKX Owner's Manual page 339

Scheduled Maintenance 339
To assist fleet managers in maintaining proper oil change intervals, the
idle meter will help determine when an oil change is required. For every
hour that the vehicle idles, it has accumulated the equivalent of
approximately 33 miles (53 kilometers) of driving. Using the combination
of the vehicle odometer and idle meter allows the fleet manager to better
determine when the oil needs to be changed
Engine idle hour meter calculation:
Idle hours x 33 = miles (kilometers) equivalency
Miles (kilometers) driven + miles (kilometers) equivalency = oil change
interval
Example: When the odometer has accumulated 3000 miles
(4800 kilometers) and the idle meter shows 61 hours, a 5000 mile
(8000 kilometers) oil change interval will have been reached: 3000 road
miles (4800 road kilometers) + (61 idle hours x 33 miles [53 km]/idle
hour) = 5013 miles (8067 kilometers).
2013 MKX (mkx)
Owners Guide gf, 2nd Printing
USA (fus)