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MAINTENANCE SCHEDULE — DIESEL ENGINE
CAUTION!
Failure to perform the required maintenance items
may result in damage to the vehicle.
At Each Stop For Fuel
Check the engine oil level at least 30 minutes after a fully
warmed engine is shut off. Checking the oil level while
the vehicle is on level ground will improve the accuracy
of the oil level reading. Add oil only when the level is at
or below the ADD or MIN mark.Once A Month
•Inspect the batteries, and clean and tighten the termi-
nals as required.
•Check the fluid levels of the coolant reservoir, brake
master cylinder, and automatic transmission (if
equipped), and add as needed.
At Each Oil Change
•Change the engine oil filter.
•Inspect the exhaust system.
•Inspect engine air filter.
•Check the coolant level, hoses, and clamps.
•Lubricate outer tie rod ends.
Inspection and service should also be performed anytime
a malfunction is observed or suspected. Retain all re-
ceipts.
334 MAINTENANCE SCHEDULE
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Oil Change Indicator System — Cummins®
Diesel
Your vehicle is equipped with an engine oil change
indicator system. This system will alert you when it is
time to change your engine oil by displaying the words
“Oil Change Due” on your Electronic Vehicle Informa-
tion Center (EVIC). The oil change reminder will remind
the owner to change the engine oil every 15,000 miles or
500 hours, whichever comes first, except for the Chassis
Cab models that are using B20 biodiesel, which are 12,500
miles or 400 hours, whichever comes first. Failure to
change the engine oil per the maintenance schedule can
result in internal engine damage.Your authorized dealer will reset the oil change indicator
message after completing the scheduled oil change. If a
scheduled oil change is performed by someone other
than your authorized dealer, the message can be reset by
referring to the steps described under “Electronic Vehicle
Information Center (EVIC)” in “Understanding Your
Instrument Panel” for further information.
Replace the engine oil and oil filter every 15,000 miles
(24 000 km) or six months, or sooner if prompted by the
oil change indicator system. Under no circumstances
should oil change intervals exceed 15,000 miles (24
000 km) or six months, whichever comes first.
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MAINTENANCE SCHEDULE 335
Page 339 of 360
Maintenance Chart — Cummins Diesel Engine
Mileage or time passed (which-
ever comes first):
7,500
15,000
22,500
30,000
37,500
45,000
52,500
60,000
67,500
75,000
82,500
90,000
97,500
105,000
112,500
120,000
127,500
135,000
142,500
150,000
Or Months: 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
Or Kilometers:
12,000
24,000
36,000
48,000
60,000
72,000
84,000
96,000
108,000
120,000
132,000
144,000
156,000
168,000
180,000
192,000
204,000
216,000
228,000
240,000
Change engine oil every 15,000
miles (24 000 km) or six months
or 500 Hours or sooner if
prompted by the oil change indi-
cator system, whichever comes
first. **XXXXXXXXXXXXXXXXX X XX
Additional Inspections
Check the Diesel Exhaust Fluid
(DEF) tank, refill if necessary.XXXXXXXXXXXXXXXXX X XX
Rotate the tires. X X X X X X X X X X X X X X X X X X X X
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MAINTENANCE SCHEDULE 337
Page 341 of 360
Mileage or time passed (which-
ever comes first):
7,500
15,000
22,500
30,000
37,500
45,000
52,500
60,000
67,500
75,000
82,500
90,000
97,500
105,000
112,500
120,000
127,500
135,000
142,500
150,000
Or Months: 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
Or Kilometers:
12,000
24,000
36,000
48,000
60,000
72,000
84,000
96,000
108,000
120,000
132,000
144,000
156,000
168,000
180,000
192,000
204,000
216,000
228,000
240,000
Inspect drive belt; replace as nec-
essary.XXXXXX
Inspect wheel bearings. X X X X X
Additional Maintenance
Replace engine fuel filter element. X X X X X X X X X X
Replace chassis mounted fuel
filter element.XXXXXXXX X X
Inspect the front and rear axle
surfaces. If gear oil leakage is
suspected, check the fluid level. If
using your vehicle for police, taxi,
fleet, off-road or frequent trailer
towing change the axle fluid. *
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MAINTENANCE SCHEDULE 339
Page 342 of 360
Mileage or time passed (which-
ever comes first):
7,500
15,000
22,500
30,000
37,500
45,000
52,500
60,000
67,500
75,000
82,500
90,000
97,500
105,000
112,500
120,000
127,500
135,000
142,500
150,000
Or Months: 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
Or Kilometers:
12,000
24,000
36,000
48,000
60,000
72,000
84,000
96,000
108,000
120,000
132,000
144,000
156,000
168,000
180,000
192,000
204,000
216,000
228,000
240,000
Inspect the transfer case fluid
(4x4), change for any of the fol-
lowing: police, taxi, fleet, or fre-
quent trailer towing.XXXX X
Change the transfer case fluid
(4x4).XX
Change automatic transmission
fluid (AS69RC transmission only).XXXX X
Change the automatic transmis-
sion fluid and sump filter
(AS69RC transmission only).XX
340 MAINTENANCE SCHEDULE
Page 343 of 360
Mileage or time passed (which-
ever comes first):
7,500
15,000
22,500
30,000
37,500
45,000
52,500
60,000
67,500
75,000
82,500
90,000
97,500
105,000
112,500
120,000
127,500
135,000
142,500
150,000
Or Months: 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
Or Kilometers:
12,000
24,000
36,000
48,000
60,000
72,000
84,000
96,000
108,000
120,000
132,000
144,000
156,000
168,000
180,000
192,000
204,000
216,000
228,000
240,000
Change automatic transmission
fluid and filter(s) if using your ve-
hicle for any of the following: po-
lice, fleet, or frequent trailer tow-
ing (68RFE transmission only).XX
Change automatic transmission
fluid and filter(s).X
Change the manual transmission
fluid if using your vehicle for any
of the following: police, fleet, or
frequent trailer towing.XX
Replace Crankcase Ventilation
Filter (CCV).XX
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MAINTENANCE SCHEDULE 341
Page 345 of 360

Inspection and service should also be performed anytime a
malfunction is observed or suspected. Retain all receipts.
* Inspect the front and rear axle surfaces every 20,000
miles (32,000 km). If gear oil leakage is suspected, check
the fluid level. If using your vehicle for police, taxi, fleet,
off-road or frequent trailer towing change the axle fluid
every 20,000 miles (32,000 km).
** Under no circumstances should oil change intervals
exceed 15,000 miles (24 000 km) or six months or 500
Hours, whichever comes first.
**** Under no circumstances should the air cleaner filter
element exceed 30,000 miles (48,000 km) or 24 months,
whichever comes first.
CAUTION!
***The manufacturer highly recommends that all
cooling system service, maintenance, and repairs be
performed by your local authorized dealer.
WARNING!
•You can be badly injured working on or around a
motor vehicle. Do only service work for which you
have the knowledge and the right equipment. If
you have any doubt about your ability to perform a
service job, take your vehicle to a competent me-
chanic.
•Failure to properly inspect and maintain your ve-
hicle could result in a component malfunction and
effect vehicle handling and performance. This
could cause an accident.
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MAINTENANCE SCHEDULE 343