1998 GMC Sonoma Owner's Manual - Page 331

I Short Trip/City Maintenance Schedule I I DATE MILEAGE 3,000 Miles (5 000 km) 0 Change engine oil and filter (or every3 months, whichever occurs first). An Emission Control Service. 0 Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote#.) 0 Check readfront axle fluidlevel and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote **.) I 6,000 Miles (I 0 000 km) 0 Change engine oil and filter (or every3 months, whichever occurs first). An Emission Control Service. 0 Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote#.) 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals forleaking. (See footnote**.) Rotate tires. See "Tire Inspection and Rotation'' in the Index for proper rotation pattern and additional information. (See footnote +.) DATE I 7-9