1998 GMC Sonoma Owner's Manual - Page 359

Long Tripmighway Maintenance Schedule I 75,000 Miles (125 000 km) 0 Change engine oil and filter (or every 12 months, whichever occurs first). An Emissioll Control Service. 0 Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote#.) Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote **:) 0 Change automatic transmission fluid and filterif 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 mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. If)?octdo not use yocu vehicle ~ m d e any o f these conditions, cl~cruge r the,fluid arid.filter every 50,000 miles (83 000 k k ) . 0 Rotate tires. See"Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote+.) DATE I ACTUAL MILEAGE I SERVICED BY 7-37