1996 GMC Suburban Owner's Manual - Page 340

Short TripKity Maintenance Schedule -- Gasoline Engines 30,000 Miles (50 000 km) 0Change engineoil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 0If your engine has a thermostatically controlled cooling fan, inspect all hoses and ducts for proper hook-up (or every 12 months, whichever occurs first). Be sure the valve works properly. This is a Noise Emission Control Service. Applicableonly to vehicles sold in the United States. 0Lubricate chassis components; seefootnote ## (or every 3 months, whichever occurs first). 0Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. :W 0For Two-Wheel-Drive vehicles only: Clean and repack the front wheel bearings (or at each brake relining, whichever occurs first). 0Replace fuel filter. An Emission Corn-01Service. 0Vehicles With GVWR Above 8,500 lbs. Only: Inspect shields and underhood insulation for damage or looseness. Adjust or replace as required. This is LI Noise Emission Control Service. Applicable only to vel?icles sold in the United States. 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. During tire rotation, check brake calipers for Ereedom of movement. Refer to the appropriateGM service manual for proper caliper service procedures. 7-12