1998 GMC Sonoma Owner's Manual - Page 354

Long Trip/Highway Maintenance Schedule 30,000 Miles (50 000 km) 0 Change engine oil and filter (orevery 12 months, whichever occurs first). An Emission Control Service. Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote #.) 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (Seefootnote *'+.) 0 For Two-Wheel-Drive vehicles only: Clean and repack the front wheel bearings (or at each brake relining, whichever occurs first). 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. - In hilly or nlountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. / f y o u do not L I S your vehicle llrzcler L I H ~of these conditions, chmge tlze.fluid ~ undfi'lter every 50,000 miles (83 000 kn?). 0 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) 0 Replace fuel filter. At7 Emission Cmtr'ol Servicr. (See footnote?.) 0 Replace air cleaner filter. An Emissim CoI1tml Service. DATE ACTUAL MILEAGE I SERVICED BY: 7-32