Scheduled Maintenance
The services shown in this schedule up to 100,000 miles
(166 000 km) should be repeated after 100,000 miles
(166 000 km) at the same intervals for the life of
this vehicle. The services shown after 100,000 miles
(166 000 km) should be repeated at the same miles (km)
after those intervals for the life of this vehicle.
Gasoline engine vehicles and some DURAMAX
®
diesel
and Isuzu diesel engine vehicles have a computer
that lets you know when to change the engine oil. This
is not based on mileage, but on engine operation and
engine temperature. When the computer has calculated
that the oil needs changing, the Engine Oil Life System
will indicate that a change is necessary. See Engine Oil
Life System (Gasoline Engine) on page 5-36 or Engine
Oil Life System (DURAMAX
®
/Isuzu Diesel Engines) on
page 5-37 or Engine Oil Life System (Caterpillar
®
Diesel
Engine) on page 5-39.
The “Footnotes” at the end of this Maintenance
Schedule further explain maintenance services.
See Service Publications Ordering Information on
page 7-10.
100 Miles (160 km)
❑ Wheel stud nut service. (36)
1,000 Miles (1 600 km)
❑ Wheel stud nut service. (36)
❑ Rear axle air shift motor service. (10)
7,500 Miles (12 000 km)
❑ Gasoline Engine Only: Check engine oil life system.
If engine oil and filter are changed, reset system.
See “Engine Oil (Gasoline Engine)” in the
Index. (2) (8)
❑ Check fluid levels (or every 3 months, whichever
occurs first). (1) (5)
❑ Chassis lubrication service (or every 6 months,
whichever occurs first). (11)
❑ Spring-to-axle U-bolts and shackle bolts service. (15)
❑ Wheels and tires service. (14)
❑ Hydraulic brake service (or every 6 months,
whichever occurs first). (6) (36)
❑ Parking brake service (or every 6 months, whichever
occurs first). (21)
❑ Air brake service (or every 6 months, whichever
occurs first). (32)
❑ Air brake automatic slack adjuster service (or every
500 hours, whichever occurs first). (33)
❑ Check air brake relay valve operation and check for
leaks (or every month, or every 300 hours, whichever
occurs first).
6-5