Chevrolet 2003 Silverado 1500 Pickup Owner's Manual page 506

25,000 Miles (41 500 km)
0
Allison Transmission Only: Change automatic
transmission fluid and filters 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 don't use your vehicle under any of these
conditions, change the fluid and filter every
50,000 miles (83 000 km).
30,000
Miles (50 000 km)
u
Check readfront 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 5-74 for proper rotation pattern and additional
information. (See footnote +.)
Replace fuel filter. An Emission Control Service.
(See footnote
t.)
Replace engine air cleaner filter. An Emission
Control Service.
37,500 Miles (62 500
km)
0 Check readfront axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking.
page 5-74 for proper rotation pattern and additional
information. (See footnote
+.)
0 Rotate tires. See Tire Inspection and Rotation on
45,000 Miles (75 000 km)
u
Inspect engine air cleaner filter if you are driving in
dusty conditions. Replace filter if necessary.
An Emission Control Service. (See footnote
t.)
Check readfront 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 5-74 for proper rotation pattern and additional
information. (See footnote +.)
6-7