GMC 2003 Sonoma Owner's Manual page 386

0 Change automatic 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
reguiariy
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 every 50,000 miles
(83 000 km).
0 Rotate tires. See Tire Inspection and Rotation on
page 5-66 for proper rotation pattern and additional
information. (See footnote
+.)
22,500
Miles
(37 500 km)
0 Change engine oil and filter (or every 12 months,
whichever occurs first). An Emission Control
Service.
whichever occurs first). (See footnote #.)
0
Lubricate chassis components (or every 12 months,
0 Check readfront axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking. (See footnote
**.)
0 Rotate tires. See Tire Inspection and Rotation on
page 5-66 for proper rotation pattern ana additionai
information. (See footnote
+.)
30,000
Miles
(50 OQO km)
il Change engine oil and filter (or every 12 months,
whichever occurs first). An Emission Control
Service.
0
Lubricate chassis components (or every 12 months,
U Check readfront axle fluid level and add fluid as
whichever occurs first). (See footnote #.)
needed. Check constant velocity joints and axle seals
for leaking. (See footnote
**.)
0 For Two-Wheel-Drive vehicles only: Clean and
repack the front wheel bearings (or at each
brake relining, whichever occurs first).
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