1998 GMC Sonoma Owner's Manual - Page 347

I Short TripKity Maintenance Schedule I .- 87,000 Miles (145 000 km) Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. Lubricate chassiscomponents (or every 3 months, whichever occurs first). (See footnote#.) Check readfront axle fluid level and add fluid as needed. Check constant **.> velocity joints and axle seals for leaking. (See footnote DATE MILEAGE 1 90,000 Miles (I50 000 km) 0 Change engine oil and filter (or every3 months, whichever occurs first). An Emission Control Service. 0 Lubricate chassiscomponents (or every 3 months, whichever occurs first). (See footnote#.) Check readfront axle fluidlevel and add fluid as needed. Check constant velocity jointsand axle seals forleaking. (See footnote**.) 0 For Two-Wheel-Drive vehicles only: Clean and repack the front wheel bearings (or at each brake relining, whichever occurs first). 0 Change automatic transmission fluid and filter if the vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher. (Continued) DATE I 7-25