1997 GMC Sonoma Owner's Manual - Page 329

I Short Trip/City Maintenance SchedulFl 45,000 Miles (75 000 km) 0Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 0For Two-Wheel-Drive vehicles only: Clean and repack the front wheel bearings (or at each brake relining, whichever occurs first). 0Inspect air cleaner filter if you are driving in dusty conditions. Replace filter if necessary. An Emission Control Service. (See footnote?.) 0Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote #.) 0Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote **.) DATE ACTUAL MILEAGE SERVICED BY: 7-19