1997 GMC Sonoma Owner's Manual - Page 341

I Short TripKity Maintenance Schedule I Check 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 +.) 84,000 Miles (140 000 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 SERVICED B Y 7-31