GMC 2001 Sonoma Owner's Manual page 356

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. Manual transmission fluid doesn't
require change.
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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