The Intelligent Oil-Life Monitor adjusts change intervals for the type of driving conditions. No need to change it until it is less than 5%. Just a waste of money, especially if you have 10 quarts to change like I do.
From page 420 of the 2013 F-150 Owner's ManualNORMAL SCHEDULED MAINTENANCE AND LOG
Vehicles Equipped with a 3.5L, 3.7L or 5.0L Engine
Your vehicle is equipped with an Intelligent Oil-Life Monitor that determines
when the engine oil should be changed based on how your vehicle is used.
By using several important factors in its calculations, the monitor helps
reduce the cost of owning your vehicle and reduces environmental waste at
the same time. This means you do not have to remember to change the oil
on a mileage-based schedule; the vehicle lets you know when an oil change
is due by displaying OIL CHANGE REQUIRED in the information display.
The following table is intended to provide examples of vehicle use and its
impact on engine oil change intervals; it is provided as a guideline only.
Actual engine oil change intervals depend on several factors and generally
decrease with severity of use.