Chevrolet 2003 Silverado Owner's Manual page 511

Replace engine air cleaner filter on vehicles without
a restriction indicator. If equipped with a change
indicator, inspect the indicator. If necessary, replace
the filter. If vehicle is driven in dusty/dirty conditions,
inspect the change indicator (if equipped) at every
engine oil change. See Engine Air Cleaner/Filter on
page 5-21 for more information. An Emission
Control Service. (See footnote †.)
Inspect Evaporative Control System. Check all fuel
and vapor lines and hoses for proper hook-up,
routing and condition. Check that the purge valve
works properly, if equipped. Replace as needed. An
Emission Control Service. (See footnote †.)
67,500 Miles (112 500 km)
Check rear/front axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking.
Rotate tires. See Tire Inspection and Rotation on
page 5-71 for proper rotation pattern and additional
information. (See footnote +.)
75,000 Miles (125 000 km)
Inspect engine air cleaner filter or change indicator (if
equipped). If necessary, replace the filter. If vehicle is
driven in dusty/dirty conditions, inspect filter or
change indicator (if equipped) at every engine oil
change. See Engine Air Cleaner/Filter on page 5-21
for more information. An Emission Control Service.
(See footnote †.)
Check rear/front axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking.
®
Allison Transmission
transmission fluid and filter if the vehicle is mainly
driven under one or more of these conditions:
− In heavy city traffic where the outside
temperature regularly reaches 90°F (32°C) or
higher.
− In hilly or mountainous terrain.
− When doing frequent trailer towing.
− Uses such as found in taxi, police or delivery
service.
If you do not use your vehicle under any of these
conditions, change the fluid and filter at 100,000 miles
(166 000 km).
Rotate tires. See Tire Inspection and Rotation on
page 5-71 for proper rotation pattern and additional
information. (See footnote +.)
Only: Change automatic
6-9