Ford Super Duty (2017 year). Manual - part 145
Off-road operation
Change the rear axle fluid (Dana rear axles only - some F-
350s; all F-450s and F-550s).
Every 50000 miles (80000
km)
Change the transfer case fluid. (Four-wheel drive vehicles)
Inspect the front axle fluid. (Four-wheel drive vehicles)
*
Vehicles with dual rear wheels should rotate the front wheels when specified; rear wheels
only if unusual wear is noted.
**
Reset the Intelligent Oil-Life Monitor after engine oil and filter changes.
Using biodiesel, up to and including 20% biodiesel (B20)
Change the engine oil and filter as indicated by the
information display, and perform the services listed in the
scheduled maintenance chart.
As required
Replace the engine-mounted and frame-mounted fuel
filters.
Every 15000 miles (24000
km), six months, 600 engine
hours
Using fuel other than ultra-low sulfur diesel fuel - vehicles operated where ultra-low
sulfur diesel fuel is not required or available
Change engine oil and filter.
Every 2500 miles (4000
km) or three months (if
using high sulfur fuel with
more than 500 ppm sulfur)
Change engine oil and filter.
Every 5000 miles (8000
km) or six months (if using
high sulfur fuel with fewer
than 500 ppm sulfur)
Exceptions
Axle and Transfer Case Maintenance
Axle(s) and transfer case (4X4 only) fluid
changes or level checks are not required
unless a leak is suspected or the assembly
has been submerged in water. During long
periods of trailer towing with outside
temperatures above 70°F (21°C) or at
wide-open throttle for long periods
above45 mph (72 km/h), change the rear
axle fluid every 30,000 mi (48,000 km) if
the rear axle is filled with non-synthetic
fluid. This interval can be waived and the
150,000 mi (240,000km) service interval
can continue if the rear axle is filled with
75W140 synthetic gear fluid meeting Ford
583