2004 GMC Yukon Owner's Manual - Page 512

Additional Required Services (cont'd) Service and Miles (Kilometers) 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 5 years, whichever occurs first). An Emission Control Service. See footnote (i). Inspect engine accessory drive belt. An Emission Control Service. 25,000 (41 500) 50,000 (83 000) • 75,000 (125 000) 100,000 (166 000) • 125,000 (207 500) 150,000 (240 000) • • • • 6-8