2021 FORD F-350 fuel

Off-road operation
Inspect the wheels and related components for abnormal
noise, wear, looseness or drag.
Rotate tires, inspect tires for wear and measure the tread
depth. 1
Replace front wheel bearing grease and grease seals if
you use non-sealed bearings.
Every 30,000 mi
(48,000 km)
1 Rotate the front wheels on vehicles with dual rear wheels when specified. Only rotate
the rear wheels if you notice unusual wear. Exclusive use of E85 - Flex Fuel Vehicles Only
If ran exclusively on E85, fill the fuel tank full with regular
unleaded fuel.
Every oil change interval
Diesel Engine
If you operate your vehicle primarily in any
of the following conditions, you need to
perform extra maintenance as indicated.
If you operate your vehicle occasionally
under any of these conditions, it is not
necessary to perform the extra
maintenance. For specific
recommendations, see your dealership
service advisor or technician. Towing a Trailer or Using a Car-top Carrier
Change the engine oil and filter as indicated by the
information display, and perform the services listed in the
scheduled maintenance chart.
As required
See the axle maintenance items under
Exceptions.
Replace the engine-mounted and frame-mounted fuel
filters.
Every
15,000 mi
(24,000 km) or six months,
600 engine hours
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Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Scheduled Maintenance

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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Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Scheduled Maintenance

ELECTROMAGNETIC
COMPATIBILITY
WARNING: Do not place objects
or mount equipment on or near the
airbag cover, on the side of the front or
rear seatbacks, or in areas that may
come into contact with a deploying
airbag. Failure to follow these
instructions may increase the risk of
personal injury in the event of a crash. WARNING: Do not fasten antenna
cables to vehicle wiring, fuel pipes and
brake pipes. WARNING:
Keep antenna and
power cables at least 4 in (10 cm) from
any electronic modules and airbags. Note:
We test and certify your vehicle to
meet electromagnetic compatibility
legislation. It is your responsibility to make
sure that any equipment an authorized
dealer installs on your vehicle complies with
applicable local legislation and other
requirements. Installation of some
aftermarket electronic devices could
degrade the performance of vehicle
functions, which use radio frequency signals
such as broadcast radio receiver, tire
pressure monitoring system, push button
start, Bluetooth®
connectivity or satellite
navigation.
Note: Any radio frequency transmitter
equipment in your vehicle (such as cellular
telephones and amateur radio transmitters)
must keep to the parameters in the
following illustrations and table. We do not
provide any other special provisions or
conditions for installations or use.
Car/SUV 618
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- AppendicesE239120

Car Wash
See: Cleaning the Exterior.............................. 392
Catalytic Converter......................................195
On-Board Diagnostics (OBD-II)................... 196
Readiness for Inspection and Maintenance (I/M) Testing.................................................... 197
Center Console
................................................171
Changing a Bulb...........................................383
Cargo Lamp and Central High Mounted
Brake Lamp Bulbs........................................ 385
Fog Lamp Bulbs................................................. 384
Front Park and Direction Indicator Lamp Bulbs.................................................................. 383
Headlamp Bulbs................................................ 383
LED Lamps.......................................................... 386
License Plate Lamp Bulb............................... 386
Rear Lamps, Brake Lamps, Rear Direction Indicator and Reversing Lamp
Bulbs................................................................. 384
Changing a Fuse
..........................................346
Fuses...................................................................... 346
Changing a Road Wheel...........................429 Dissimilar Spare Wheel and Tire Assembly
Information..................................................... 429
Jacking the Vehicle............................................ 434
Location of the Spare Tire and Tools........430
Stowing the Flat Tire or Spare Tire.............439
Tire Change Procedure.................................... 430
Changing the 12V Battery.........................379 Battery Management System...................... 380
Changing the Engine Air Filter - 6.2L
.................................................................357
Changing the Engine Air Filter - 6.7L Diesel............................................................358
Air Filter Restriction Gauge............................ 359
Changing the Engine Air Filter - 7.3L.................................................................360
Changing the Engine-Mounted and Diesel Fuel Conditioner Module Fuel
Filters - 6.7L Diesel...................................386
Diesel Fuel Conditioner Module Filter................................................................... 386
Engine-mounted Fuel Filter.......................... 389
Changing the Engine Oil and Oil Filter...............................................................356
Engine lubrication for severe service operation......................................................... 356Changing the Vehicle Wi-Fi Hotspot
Name or Password...................................478
Changing the Wiper Blades.....................382
Checking MyKey System Status..............64 MyKey Distance.................................................... 64
Number of Admin Keys...................................... 64
Number of MyKeys.............................................. 64
Checking the Wiper Blades.....................382
Child Restraint and Seatbelt Maintenance.................................................44
Child Restraint Positioning.........................35
Child Safety
......................................................22
General Information............................................ 22
Child Safety Locks..........................................37 Left-Hand Side...................................................... 37
Right-Hand Side................................................... 37
Cleaning Leather Seats
.............................397
With King Ranch Edition................................. 398
Without King Ranch Edition........................... 397
Cleaning Products
........................................391
Materials................................................................ 391
Cleaning the Engine
....................................393
Cleaning the Exhaust - 6.7L Diesel.......394
Cleaning the Exterior..................................392 Cleaning the Exterior Lamps......................... 392
Cleaning the Exterior Precautions...............392
Exterior Chrome Parts...................................... 392
Exterior Plastic Parts........................................ 392
Stripes or Graphics............................................ 392
Underbody........................................................... 393
Under Hood......................................................... 393
Cleaning the Instrument Panel and Instrument Cluster Lens
.........................397
Cleaning the Interior...................................395
Cleaning the Wheels..................................399
Cleaning the Windows and Wiper Blades...........................................................394
Clearing All MyKeys.......................................63
Climate.............................................................531 Accessing Rear Climate Controls................533
Accessing the Climate Control Menu..........531
Directing the Airflow.......................................... 531
Rear Climate Control Lock Indicator..........533
Setting the Blower Motor Speed.................. 531
Setting the Temperature.................................. 531
Switching Auto Mode On and Off................531
Switching Dual Zone Mode On and Off....................................................................... 532
649
Super Duty (TFE) Canada/United States of America, enUSA, Edition date: 202008, Third-Printing- Index