FORD F-350 2021 Owners Manual

Towing a Trailer or Using a Car-top Carrier
Replace the wheel bearing grease and grease seals if you
use non-sealed bearings. Two-wheel drive vehicles.
Every 30,000 mi
(48,000 km)
Flush and refill the coolant.
At
60,000 mi (96,000 km)
or 2400 engine hours
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. Frequent or Extended Idling - Over 10 Minutes Per Hour of Normal Driving or Frequent
Low-speed Operation if you use your Vehicle for Stationary Operation
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
Flush and refill the coolant.
At
60,000 mi (96,000 km)
or 2400 engine hours
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. Frequent Low-speed Operation, Consistent Heavy Traffic Under 25 mph (40 km/h) or
Long Rush-hour Traffic
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
Flush and refill the coolant.
At
60,000 mi (96,000 km)
or 2400 engine hours
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.
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Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Scheduled Maintenance

Sustained High-speed Driving at Gross Vehicle Weight Rating - Maximum Loaded Weight
for Vehicle Operation
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 you
use non-sealed bearings. Two-wheel drive vehicles.
Every
30,000 mi
(48,000 km)
Flush and refill the coolant.
At
60,000 mi (96,000 km)
or 2400 engine hours
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, inspect the tires for wear and measure
tread depth.1
Every
7,500 mi (12,000 km)
Inspect the brake system pads and rotors.
Inspect the air filter restriction gauge. Replace the air filter
if necessary.2
Inspect the steering, suspension ball joints and the tie rods.
Lubricate any grease fittings.
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Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Scheduled Maintenance

Operating in Dusty or Sandy Conditions (Such as Unpaved or Dusty Roads)
Change the engine oil and filter. 3
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 you
use non-sealed bearings. Two-wheel drive vehicles.
1 Rotate the front wheels on vehicles with dual rear wheels when specified. Only rotate
the rear wheels if you notice unusual wear.
2 Reset the engine air filter information monitor after you replace the air filter.
3 Reset the Intelligent Oil-Life Monitor after engine oil and filter changes. Off-road Operation
Inspect the 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, suspension ball joints and the tie rods.
Lubricate any grease fittings.
Rotate the tires, inspect the tires for wear and measure
the tread depth.1
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 air filter
if necessary.2
Change the engine oil and filter. 3
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)
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Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Scheduled Maintenance

Off-road Operation
Replace the wheel bearing grease and grease seals if you
use non-sealed bearings. Two-wheel drive vehicles.
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 Rotate the front wheels on vehicles with dual rear wheels when specified. Only rotate
the rear wheels if you notice unusual wear.
2 Reset the engine air filter information monitor after you replace the air filter.
3 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 the 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 the 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)
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Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Scheduled Maintenance

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 441).
Additional Axle Maintenance for Dual
Rear Wheels
Change the rear axle fluid every
250,000 mi (400,000 km)
under normal
driving conditions on all commercial
applications. When you operate 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 you operate 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.
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In this case, the engine control system
illuminates 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, the engine control system
illuminates a service light, wrench or engine
icon to inform you to bring your vehicle into
a dealer for service.
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Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Scheduled Maintenance

RADIO FREQUENCY
CERTIFICATION LABELS
Blind Spot Information System
Sensors (If Equipped)
Argentina Brazil
China
CMIIT ID: 2015DJ1610 Djibouti
European Union EU
Ghana
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Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Customer InformationE337180 E340516 E340204 E340826 E310043 E269695

Jamaica
Malaysia
RALM/24A/0715/S(15-2272)
Mauritania Moldova
Pakistan
Paraguay
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Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Customer InformationE340517 E269697 E340199 E337971 2018E340825 E337181

Serbia
Singapore
South Africa South Korea
MSIP-CRM-8DC-SRR3B
Taiwan, China
Ukraine
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Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Customer InformationE340200 E339940 E269696 E339675 E340203 E338024

United Arab Emirates (U.A.E.)
United States and Canada
WARNING: Changes or
modifications not expressively approved
by the party responsible for compliance
could void the user's authority to operate
the equipment. The term "IC:" before the
radio certification number only signifies
that Industry Canada technical
specifications were met.
FCC ID: OAYSRR3B
IC: 4135A-SRR3B
IC: RSS-310 compliant, Per FCC Test report
no.: 1-8707-14-01-03
This device complies with Part 15 of the
FCC Rules and with Innovation, Science
and Economic Development Canada ’s
licence-exempt RSS(s). Operation is
subject to the following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including
interference that may cause undesired
operation. Vietnam
Zambia
Body Control Module
Argentina
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Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Customer InformationE338020 E269693 E340205 E338547