GMC Sierra 3500HD 2001 Owner's Manual page 272

Short Trip/City Scheduled Maintenance
60,000 Miles (100 000 km) (Continued)
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Diesel Engine Only: If your engine has a thermostatically controlled cooling
fan, inspect all hoses and ducts for proper hook
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.
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Diesel Engine Only: Check the crankcase depression regulator valve
system for any worn, plugged or collapsed hoses. See service manual.
An Emission Control Service.
63,000 Miles (105 000 km)
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Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
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Lubricate chassis components (or every 3 months, whichever occurs first).
(See footnote #.)
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Check rear axle fluid level and add fluid as needed.
7-22
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up (or every 12 months,
DATE
ACTUAL
SERVICED BY:
MILEAGE