1998 GMC Sonoma Owner's Manual - Page 339

I ShortTrip/CityMaintenanceSchedule 1 0 For Two-Wheel-Drive vehicles only: Clean ana 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. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. I f y o ~ l not use ~ Q W vehicle under. m y of these corzditions, c~hmgv do theflLtid andfilter every 50,000 miles (83 000 kin). 0 Inspect air cleaner filterif you are driving in dusty conditions. Replace filter if necessary. An Emission Control Service. (See footnote-I.) 48,000 Miles (80 000 km) 0 Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 0 Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote#.) (Continued) DATE I ACTUAL MILEAGE I SERVICEDBY: I I