GMC 1996 Sierra Owner's Manual page 338

Short Trip/City Maintenance Schedule
--
Gasoline Engines
30,000 Miles (50 000 km)
0
Change engine oil and filter (or every
3
months, whichever occurs first).
An Emission Control Service.
0.
Lubricate chassis components; see footnote #
(or every
3
months, whichever occurs first).
0
Check readfront axle fluid level and add
fluid as needed. Check constant velocity
joints and axle seals for leaking.
**
0
For Two-Wheel-Drive vehicles only: Clean
and repack the front wheel bearings (or at
each brake relining, whichever occurs first).
0
Replace fuel filter.
An Emission Control Service.
f
0
Vehicles With GVWR Above 8,500 lbs.
Only: Inspect shields and underhood
insulation for damage or looseness. Adjust
or replace as required.
This is a Noise Emission
Control Service. Applicable only to vehicles sold in
the United States.
0
If your engine has a thermostatically
controlled cooling fan, inspect all hoses
and ducts for proper hook-up (or every
12 months, whichever occurs first). Be sure
the valve works properly.
This is a Noise
Emission Control Service. Applicable .only to
vehicles sold in the United States.
Rotation" in the Index for proper rotation
pattern and additional information. During
tire rotation, check brake calipers for
freedom of movement. Refer to the
appropriate GM service manual for proper
calir>er service procedures.
0
Rotate tires. See "Tire Inspection and
7-12