1997 GMC Sonoma Owner's Manual - Page 326

I Short Trip/City Maintenance Schedule I 36,000 Miles (60 000 km) 0Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 33,000 Miles (55 000 km) Change 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 #.) 0Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote ** .) 0Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote #.) DATE ACTUAL MILEAGE SERVICED B Y 7-16