GMC Sierra 3500HD 2001 Owner's Manual page 279

Short Trip/City Scheduled Maintenance
96,000 Miles (160 000 km)
j
Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
j
Lubricate chassis components (or every 3 months, whichever occurs first).
(See footnote #.)
j
Check rear axle fluid level and add fluid as needed.
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
j
Diesel Engine Only: Replace fuel filler cap if driving in dusty conditions.
An Emission Control Service.
99,000 Miles (165 000 km)
j
Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
j
Lubricate chassis components (or every 3 months, whichever occurs first).
(See footnote #.)
j
Check rear axle fluid level and add fluid as needed.
DATE
ACTUAL
SERVICED BY:
MILEAGE
DATE
ACTUAL
SERVICED BY:
MILEAGE
7-29