1997 GMC Sonoma Owner's Manual - Page 348

' Long Tripmighway Maintenance Schedule 0Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle sealsfor leaking. (See footnote **.) 17 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) 7,500 Miles (12 500 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. 0Lubricate chassis components (or every 12 months, whichever occursfirst). (See footnote #.) DATE ACTUAL MILEAGE SERVICED BY: 7-38