1997 GMC Suburban Owner's Manual - Page 389

Long Tripmighway Maintenance Schedule Gasoline Engines -- 30,000 Miles (50 000 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) 0Replace fuel filter. An Emission Control Service. (See footnote?.) 0Vehicles With GVWR Above 8,500 lbs. Only: Inspect shields and underhood insulation for damage or looseness. Adjust or replace as required. This is a Noise Emission Control Service. Applicable onlyto vehicles sold in the United States. 0Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote #.) 0Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote **.) 0For Two-Wheel-Drive vehicles only: Clean and repack the front wheel bearings (or at each brake relining, whichever occurs first). DATE ACTUAL MILEAGE SERVICED B Y 7-33