1997 GMC Safari Owner's Manual - Page 350

I Short WiplCity Maintenance Schedule I 0Change automatic transmission fluid and filter if the vehicleis mainly driven under one or more of these conditions: - In heavy city traffic wherethe outside 90 temperature regularly reaches O F (32°C) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as foundin taxi, police or delivery service. If you donot use your vehicle under anyof these conditions, change the fluid and filter every 30,000 miles (50 000 krn). 90,000 Miles (150 000 km) 0Change engine oil and filter (or every 3 months, whichever occursfirst). An Emission Control Service. 0Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote #.) 0Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote **.) 0For Two-Wheel-Drive vehiclesonly: Clean and repackthe front wheel bearings (or at each brake relining, whichever occurs first).