2002 GMC Sonoma Owner's Manual - Page 398

Short Trip/City Scheduled Maintenance An Emission Control Service. (See footnote [.) j Replace engine air cleaner filter. An Emission Control Service. 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 For Two-Wheel-Drive vehicles only: Clean and repack the front wheel bearings (or at each brake relining, whichever occurs first). j 4.3L V6 Engine Only: Replace fuel filter. 30,000 Miles (50 000 km) DATE ACTUAL MILEAGE SERVICED BY: 7-14