GMC 2004 Yukon XL Owner's Manual page 512

Additional Required Services (cont'd)
25,000 50,000 75,000 100,000 125,000 150,000
Service and Miles (Kilometers) (41 500) (83 000) (125 000) (166 000) (207 500) (240 000)
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.
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