GMC 1996 Sierra Owner's Manual page 341

Short Trip/City Maintenance Schedule
--
Gasoline Engines
45,000 Miles (75 000 km)
0
Change engine oil and filter (or every
3 months, whichever occurs first).
An Etnission 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
Vehicles With GVWR Above 8,500 lbs.
Only: Inspect shields and underhood
insulation for damage or looseness. Adjust
or replace as required.
This is Noise Emission
Control Service. ApplicLrhle
on14:
to v e h i c k sold i n
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
velzicles sold in the United Stcrtes.
DATE ACTUAL MILEAGE SERVICED B Y
7-15