2007 GMC Yukon Owner's Manual - Page 558

Additional Required Services (cont'd) Service and Miles (Kilometers) Replace spark plugs and inspect spark plug wires. An Emission Control Service. Engine cooling system service (or every five years, whichever occurs first). An Emission Control Service. See footnote (i). Inspect engine accessory drive belt. An Emission Control Service. See footnote (m). 25,000 (40 000) 50,000 (80 000) 75,000 (120 000) 100,000 (160 000) • 125,000 (200 000) 150,000 (240 000) • • Maintenance Footnotes † The U.S. Environmental Protection Agency or the California Air Resources Board has determined that the failure to perform this maintenance item will not nullify the emission warranty or limit recall liability prior to the completion of the vehicle's useful life. We, however, urge that all recommended maintenance services be performed at the indicated intervals and the maintenance be recorded. # Lubricate the front suspension, steering linkage, transmission shift linkage, and parking brake cable guides. Control arm ball joints on 2500 series vehicles require lubrication but should not be lubricated unless their temperature is 10°F (−12°C) or higher, or they could be damaged. Control arm ball joints on 1500 series vehicles are maintenance-free. 558