1997 GMC Sonoma Owner's Manual - Page 351

' Long Trip/HighwayMaintenanceSchedule 30,000 Miles (50000 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. ~ ~ 0For Two-Wheel-Drive vehicles only: Clean and repack thefront wheel bearings (or at each brake relining, whichever occurs first). Rotate tires. See "Tire Inspection and Rotation'' in the Index for proper rotation pattern and additional information. (See footnote +.) 0Replace fuel filter. AIZEmission Control Service. (See footnote?.) 0Replace air cleaner filter. An Emission Control Service. 0Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote #.) 0Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote ** .) DATE ACTUAL MILEAGE SERVICED BY: 7-41