1998 GMC Sonoma Owner's Manual - Page 360

I LungTrip/HighwayMaintenanceSchedule I 82,500 Miles (137 500 km) 0 Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. 0 Lubricate chassiscomponents (or every I2 months, whichever occurs first). (See footnote #.) 0 Check readfront axle fluidlevel and add fluid as needed. Check constant velocity joints and axle seals forleaking. (See footnote **.) 0 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) DATE 1 MILEAGE I SERVICEDBY 1 I 90,000 Miles (150 000 km) 0 Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. 0 Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote #.) 0 Check readfront axle fluidlevel and add fluid as needed. Check constant velocity joints and axle seals forleaking. (See footnote **.) 0 For Two-Wheel-Drive vehicles only: Clean and repack the front wheel bearings (or at each brake relining, whichever occurs first). DATE 7-38