1996 GMC Sonoma Owner's Manual - Page 331

I Long Trip/Highway Maintenance Schedule. 52,500 Miles (87 500 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Confro1Ser??ics. 0Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking.*'I' 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. 0Lubricate the front suspension, ball joints, steering linkage and transfer case shift linkage, parking brake cable guides, propshaft splines, universal joints, brake pedal springs and clutch pedal springs at every oil change (or every 12 months, whichever occurs first).