1996 GMC Safari Owner's Manual - Page 339

Long Tripmighway Maintenance Schedule 97,500 Miles (162 500 km) - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. 0Lubricate chassis components; see footnote# (or every 1 2 months, whichever occurs first). 0Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking.** 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. During tire rotation, check brake calipers for freedom of movement. Refer to the appropriate GM service manual for proper caliper service procedures. DATE ACTUAL MILEAGE SERVICED B Y 7-39