1995 GMC Yukon Owner's Manual - Page 440

- Maintenance Schedule I - Diesel Engines 40,000 Miles (64000 km) Change engine oil and filter (or every 3 months, whichever occurs first). Arz Emission Control Sorviw. 0 Lubricate the front suspension, king pin bushings, steering linkage, transmission shift linkage, transfer case shift linkage, parking brake cable guides, rear driveline center splines, front axle propshaft splines, brake pedal springs and clutch pedal springs. Ball joints and king pin bushings should not be lubricated unless their temperature is 10" F (-12" C), or higher. When weather is cold, let the ball joints and king pin bushings warm up before lubrication or they could be damaged. Perform each of the listed lubrication service items at this mileage whichever occurs first). interval (or every 12 ~nonths, 0 Inspect shields and underhood insulation for damage or looseness. Adjust or replace as required. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States. 0 Check the air intake system installation to assure that gaskets are properly sealed and that all hose connections, fasteners and other components are tight. Also check to be sure that the air cleaner housing is properly seated, the cover fits tightly and the wing nuts are tight. Tighten connections and fasteners or replace damaged parts as necessary. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States. 0 If your engine has a thermostatically controlled cooling fan, inspect all hoses and ducts for proper hook-up (or every I2 months, whichever occurs first). Be sure the valve works properly. This is a Noise Emission Control Service. Applicable onlyto vehicles soldin the United States. Check readfront axle fluid level and add fluid a s needed. Check constant velocity joints and axle seals for leaking. ':i !:: DATE ACTUAL MILEAGE SERVICED BY: 7-72