2006 GMC Yukon Owner's Manual - Page 497

Additional Required Services (cont'd) Service and Miles (Kilometers) Four-wheel drive: Change transfer case fluid. See footnote (g). Inspect evaporative control system. An Emission Control Service. See footnotes † and (k). 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 (41 500) 50,000 (83 000) • • 75,000 (125 000) 100,000 (166 000) • • 125,000 (207 500) 150,000 (240 000) • • • • • 6-7