1998 GMC Sonoma Owner's Manual - Page 336

1 ShortTrip/CityMaintenanceSchedule I 30,000Miles (SO 000 (Corztinuedj knz) For Two-Wheel-Drive vehicles only: Clean and repack the front wheel bearings (or at each brake relining, whichever occurs first). Replace fuel filter. An EIn.ission Control Service. (See footnote?. j Replace air cleaner filter. An Emission Control Service. 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 mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. I f y o ~ do nor me your vehich? under m y of these corzditiorls, change the.jlcrid i &. &/.filter every 50,000 miles (83 000 I) 0 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) 7-14