Page 23 of 56
F-450
Fifth
Wheel
OptionRear axle
ratioMaximum GCWR -
kg (lbs.)Maximum
trailer weight -
kg (lbs.)
Regular Chassis Cab 4x2
7.3L All 11793 (26000) 8210 (18100)
Regular Chassis Cab 4x4
7.3L All 11793 (26000) 8074 (17800)
SuperCab Chassis Cab 4x2 with manual transmission
7.3L All 11793 (26000) 8029 (17700)
SuperCab Chassis Cab 4x2 with automatic transmission
7.3L All 11793 (26000) 8074 (17800)
SuperCab Chassis Cab 4x4 with manual transmission
7.3L All 11793 (26000) 7847 (17300)
SuperCab Chassis Cab 4x4 with automatic transmission
7.3L All 11793 (26000) 7893 (17400)
Crew Cab Chassis Cab 4x2
7.3L All 11793 (26000) 7938 (17500)
Crew Cab Chassis Cab 4x4
7.3L All 11793 (26000) 7802 (17200)
Driving tips
23
Page 24 of 56
F-550
Fifth
Wheel
OptionRear axle
ratioMaximum GCWR -
kg (lbs.)Maximum
trailer weight -
kg (lbs.)
Regular Chassis Cab 4x2
7.3L All 11793 (26000) 8165 (18000)
Regular Chassis Cab 4x4
7.3L All 11793 (26000) 8029 (17700)
SuperCab Chassis Cab 4x2
7.3L All 11793 (26000) 8029 (17700)
SuperCab Chassis Cab 4x4 with manual transmission
7.3L All 11793 (26000) 7802 (17200)
SuperCab Chassis Cab 4x4 with automatic transmission
7.3L All 11793 (26000) 7847 (17300)
Crew Cab Chassis Cab 4x2 with manual transmission
7.3L All 11793 (26000) 7893 (17400)
Crew Cab Chassis Cab 4x2 with automatic transmission
7.3L 4.88 11793 (26000) 7939 (17500)
7.3L 5.38 13608 (30000) 9752 (21500)
Crew Cab Chassis Cab 4x4
7.3L All 11793 (26000) 7756 (17100)
Driving tips
24
Page 33 of 56

Do not handle a hot oil filter with bare hands.
Clean the filter mounting area on the oil cooler, lightly coat the gasket
surface of the new filter with clean engine oil and hand tighten until the
gasket contacts the base.Then tighten another 1–1/4 to 2 turns.Fill
the crankcase and run the engine to check for leaks.
Continuous contact with USED motor oil has caused cancer in
laboratory mice. Protect your skin by washing with soap and
water.
Engine lubrication for severe service operation
The following severe service operating conditions require unique engine
maintenance procedures:
•towing a trailer over 1,600 km (1,000 miles)
•sustained, high speed driving at Gross Vehicle Weight Rating
(maximum loaded weight for vehicle operation during hot
weather-above 32°C [90°F]).
•frequent or extended idling (over 10 minutes per hour of normal
driving).
•operating in severe dust conditions.
•frequent, short trips of 16 km (10 miles) or less during freezing
weather
If you are operating your vehicle under any of these conditions, observe
the following service procedures:
•Change engine oil and filter every 5,000 km (3,000 miles).
•Use Motorcraft oil or an equivalent oil conforming to Ford
Specification WSS-M2C171–C or API categories CH-4, CH-4/SJ,
CH-4/SL or DHD-1. If CH-4 oil is not available, CG-4 is acceptable..
For more information refer theSevere Duty Maintenance Schedulein
the“Service Guide”.
REPLACING THE AIR FILTER ELEMENT
When replacing the air filter element, use the Motorcraft air filter
element listed. Refer toLubricant and Maintenance Materials
Specificationsin this supplement.
General maintenance information
33
Page 43 of 56

NOISE EMISSIONS WARRANTY, PROHIBITED TAMPERING ACTS
AND MAINTENANCE
On January 1, 1978, Federal regulation became effective governing the
noise emission on trucks over 4,536 kg (10,000 lbs.) GVWR (Gross
Vehicle Weight Rating). The following statements concerning prohibited
tampering acts and maintenance, and the noise warranty found in the
Warranty Facts Booklet, are applicable to complete chassis cabs over
4,536 (10,000 lbs.) GVWR.
Tampering with noise control system prohibited
Federal law prohibits the following acts or the causing thereof: (1) The
removal or rendering inoperative by any person other than for purposes
of maintenance, repair or replacement of any device or element of design
incorporated into any new vehicle for the purpose of noise control prior
to its sale or delivery to the ultimate purchaser or while it is in use, or
(2) the use of the vehicle after such device or element of design has
been removed or rendered inoperative by any person.
Among those acts which the U.S. Environmental Protection Agency may
presume to constitute tampering are the acts listed below:
•Removal of hood blanket, fender apron absorbers, fender apron
barriers, underbody noise shields or acoustically absorptive material.
•Tampering or rendering inoperative the engine speed governor, so as
to allow engine speed to exceed manufacturer’s specifications.
General maintenance information
43