1997 GMC Sonoma Owner's Manual - Page 332

I Short TripKity Maintenance Schedule I 54,000 Miles (90 000 km) 0Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 51,000 Miles (85 000 km) I7 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 #.) I7 Check 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 7-22