1995 GMC Yukon Owner's Manual - Page 446

I Maintenance Schedule I - Diesel Engines 60,000 Miles (100 000 km) 0 Change engine oil and filter (or every 3 months, whichever occurs first). Ai7 Emissiol7 Contt.01 Service. 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 interval (or every 12 months. whichever occurs first). 0 Drain, flush and refill the cooling system with new coolant (or every 24 months, whichever occurs first). See"Engine Coolant" in the Index for what to use. AI?Eulission Cmtt'ol S e r w k . Also inspect the hoses and replace them if they are cracked, swollen or deteriorated. Tighten a l l hose clamps (except constant tension clamps). Remove debris and clean the outside of the radiator and air conditioning condenser. Wdsh the radiator neck. To ensure proper operation, pressure test the radiator and cap. 0 Replace air cleaner filter. Replace filter more often under dusty Corm01 Ser-rk-J. '!' conditions. An E117i.s.siot1 0 For 2-Wheel Drive vehicles only: Clean and repack the front wheel bearings (or at each brake relining, whichever occurs first). 0 Check the crankcase depression regulator valve system for any worn, Ai7 plugged or collapsed hoses. See service ~nanual. Emi.s.sion Cmtl-ol Service. 0 Replace fuel filter. Replace filter sooner if it is clogged.? 0 Check the EGR System (if equipped) (except Code F engine) as described in the service manual. A7 Emission Co17trol S e r ~ ~ i c v . 1 7-78