1997 GMC Sonoma Owner's Manual - Page 322

I Short Trip/City Maintenance Schedule I 0Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote **.) 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) 18,000 Miles (30 000 km) 0Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 0Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote #.) I I DATE ACTUAL MILEAGE I SERVICED B Y I