GMC 2001 Safari Owner's Manual page 339

Short Trip/City Scheduled Maintenance
48,000 Miles (80 000 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/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking. (See footnote **.)
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
50,000 Miles (83 000 km)
j
If you haven't used your vehicle under severe service conditions listed
previously and, therefore, haven't changed your automatic transmission fluid,
change both the fluid and filter.
j
Change transfer case fluid.
51,000 Miles (85 000 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/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking. (See footnote **.)
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