GMC Sonoma 2001 Owner's Manual page 373

Long Trip/Highway Scheduled Maintenance
30,000 Miles (50 000 km) (Continued)
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
j
4.3L V6 Engine Only: Replace fuel filter.
An Emission Control Service. (See footnote
j
Replace engine air cleaner filter.
An Emission Control Service.
37,500 Miles (62 500 km)
j
Change engine oil and filter (or every 12 months, whichever occurs first).
An Emission Control Service.
j
Lubricate chassis components (or every 12 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 +.)
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