1997 GMC Safari Owner's Manual - Page 363

82,500 Miles (137 500 km) In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. - Cl Change engine oil and filter (or every 12 months, whichever occursfirst). An Emission Control Service. 0Lubricate chassis components (or every 1 2 months, whichever occursfirst). (See footnote #.) 0Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and ** axle seals for leakmg. (See footnote .) 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) If you do not use your vehicle under any o these f conditions, change the fluid and filter every 30,000 miles (50 000 km). 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) DATE ACTUAL MILEAGE SERVICED B E 7-39