Ford Super Duty (2018 year). Manual — part 148

Sustained High-speed Driving at Gross Vehicle Weight Rating (Maximum Loaded Weight

for Vehicle Operation)

Inspect the engine and secondary cooling system coolant
concentration (freeze-point protection) and additive
(corrosion inhibitor) strength. Add coolant additive if
necessary.

Every 30,000 mi
(48,000 km) or 1200 engine
hours

Flush and refill the coolant. Do not add coolant additive.

Every 60,000 mi
(96,000 km) or 2400
engine hours

Note: When adding coolant additive, do not exceed the specified maximum of 48 fluid
ounces (1.4 liters) for the engine and 16 fluid ounces (473 ml) for the secondary cooling
system. Operating the engine with excessive coolant additive may cause overheating which
could lead to severe, permanent engine damage.

Note: After the initial coolant flush and fill at 60,000 mi (96,000 km) or 2400 engine
hours, flush and fill every 45,000 mi (72,000 km) or 1800 engine hours thereafter.

Operating in Sustained Ambient Temperatures Below -9°F (-23°C) or Above 100°F (38°C)

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 15,000 mi
(24,000 km), six months or
600 engine hours

Replace the wheel bearing grease and grease seals if using
non-sealed bearings. (Two-wheel drive vehicles)

Every 30,000 mi
(48,000 km)

Operating in Dusty or Sandy Conditions (Such as Unpaved or Dusty Roads)

Rotate the tires

1

, inspect the tires for wear and measure

tread depth.

Every 7,500 mi (12,000 km)

Inspect the brake system pads and rotors.

Inspect the air filter restriction gauge. Replace the filter if
necessary.

Inspect the steering and suspension ball joints and tie rods.
Lubricate any grease fittings.

Operating in Dusty or Sandy Conditions (Such as Unpaved or Dusty Roads)

Change the engine oil and filter.

2

Every 7,500 mi (12,000 km),
six months or 300 engine
hours

Inspect and lubricate the U-joints.

Replace the engine-mounted and frame-mounted fuel
filters.

Every 15,000 mi
(24,000 km), 6 months or
600 engine hours

Replace the air inlet foam filter.

Every 30,000 mi
(48,000 km)

Replace the wheel bearing grease and grease seals if using
non-sealed bearings. (Two-wheel drive vehicles)

1

Vehicles with dual rear wheels should rotate the front wheels when specified; rear wheels

only if unusual wear is noted.

2

Reset the Intelligent Oil-Life Monitor after engine oil and filter changes.

Off-road Operation

Inspect functional holes in each leg of the twin exhaust
tips and the holes under the shield just inboard of the right
rear tire to make sure they are clean and clear of debris or
foreign materials. Refer to the Vehicle Care chapter of your
owner’s manual for more information.

As required

Inspect the steering and suspension ball joints and tie rods.
Lubricate any grease fittings.

Rotate the tires

1

, inspect the tires for wear and measure

tread depth.

Every 7,000 mi (12,000 km),
six months or 300 engine
hours

Inspect the brake system pads and rotors.

Inspect the air filter restriction gauge. Replace the filter if
necessary.

Change the engine oil and filter.

2

Every 7,000 mi (12,000 km)
or 300 engine hours

Replace the engine-mounted and frame-mounted fuel
filters.

Every 15,000 mi
(24,000 km), six months or
600 engine hours

Replace the air inlet foam filter.

Every 30,000 mi
(48,000 km)

Replace the wheel bearing grease and grease seals if using
non-sealed bearings. (Two-wheel drive vehicles).

Off-road Operation

Change the rear axle fluid (Dana rear axles only - some F-
350s; all F-450s and F-550s).

Every 50,000 mi
(80,000 km)

Change the transfer case fluid. (Four-wheel drive vehicles)

Inspect the front axle fluid. (Four-wheel drive vehicles)

1

Vehicles with dual rear wheels should rotate the front wheels when specified; rear wheels

only if unusual wear is noted.

2

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 15,000 mi
(24,000 km), six months or
300 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 2,500 mi (4,000 km)
or three months (if using
high sulfur fuel with more
than 500 ppm sulfur)

Change engine oil and filter.

Every 5,000 mi (8,000 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 above
45 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 (240,000 km) service interval
can continue if the rear axle is filled with
75W140 synthetic gear fluid meeting Ford

specification WSL-M2C192-A, part number
XY-75W140-QL, or equivalent. Add friction
modifier XL-3 (EST-M2C118-A) or
equivalent for complete refill of
Traction-Lok rear axles. See Capacities
and Specifications (page 421).

Additional Axle Maintenance for Dual
Rear Wheels

Change rear axle fluid every 250,000 mi
(400,000 km) under normal driving
conditions on all commercial applications.
When operating your vehicle at or near
maximum gross vehicle weights, change
the rear axle fluid every 60,000 mi
(96,000 km). In addition, follow this
60,000 mi (96,000 km) schedule when
operating your vehicle under the special
operating conditions where noted.

California Fuel Filter Replacement

If you register your vehicle in California, the
California Air Resources Board has
determined that the failure to perform this
maintenance item does not nullify the
emission warranty or limit recall liability
before the completion of your vehicle's
useful life. Ford Motor Company, however,
urges you to have all recommended
maintenance services performed at the
specified intervals and to record all vehicle
service.

Hot Climate Oil Change Intervals

Vehicles operating in the Middle East,
North Africa, Sub-Saharan Africa or
locations with similar climates using an
American Petroleum Institute (API)
Certified for Gasoline Engines (Certification
mark) oil of SM or SN quality, the normal
oil change interval is 3,000 mi (5,000 km).

If the available API SM or SN oils are not
available, then the oil change interval is
2,000 mi (3,000 km).

Engine Air Filter and Cabin Air Filter
Replacement

The life of the engine air filter and cabin air
filter is dependent on exposure to dusty
and dirty conditions. Vehicles operated in
these conditions require frequent
inspection and replacement of the engine
air filter and cabin air filter.

Diesel Particulate Filter

Over time, a slight amount of ash builds
up in the diesel particulate filter, which is
not removed during the regeneration
process. The filter may need to be replaced
with a new or remanufactured part at
approximately 250,000 mi (400,000 km).
Actual mileage varies depending on engine
and vehicle operating conditions.

In this case, the engine control system sets
a service light (wrench icon) to inform you
to bring your vehicle to the dealer for
service. If there are any issues with the
oxidation catalyst or particulate filter
system, a service light (wrench or engine
icon) sets by the engine control system to
inform you to bring your vehicle into a
dealer for service.