GMC 2003 Sonoma Owner's Manual page 377

27,000 Miles (45 000 km)
0 Change engine oil and filter (or every 3 months,
0 Lubricate chassis components (or every 3 months,
0 Check readfront axle fluid level and add fluid as
whichever occurs first). An Emission Control Service.
whichever occurs first). (See footnote #.)
needed. Check constant velocity joints and axle seals
for leaking. (See footnote
**.)
30,000
Miles (50 000 km)
Ll Change engine oil and filter (or every 3 months,
0 Lubricate chassis components (or every 3 months,
0
Check readfront axle fluid level and add fluid as
whichever occurs first). An Emission Control Service.
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).
Control Service. (See footnote
t.)
Control Service.
0 4.3L V6 Engine Only: Replace fuel filter. An Emission
0 Replace engine air cleaner filter. An Emission
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 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 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
+.)
33,000 Miles (55 000 km)
0
Change engine oil and filter (or every 3 months,
whichever occurs first). An Emission Control Service.
0
Lubricate chassis components (or every 3 months,
whichever occurs first). (See footnote #.)
U Check readfront axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking. (See footnote **.)
6-1 0