1997 GMC Sonoma Owner's Manual - Page 330

I Short TripKity Maintenance Schedule I 0Check readfront axle fluid level and add fluid as needed. Checkconstant velocity joints and axle seals for leaking. (See footnote * *.) 0Rotate tires. See "Tire Inspection and Rotation" in the Index proper rotation for pattern and additional information. (See footnote +.) 48,000 Miles (80 000 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 #.) DATE ACTUAL MILEAGE SERVICED B Y 7-20