GMC 2001 Yukon XL Owner's Manual page 387

Scheduled Maintenance
7,500 Miles (12 500 km)
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Drive axle service. If your vehicle is used to pull a trailer, a rear axle fluid
change is recommended after a break
after the first 500 miles (800 km) of trailer towing. See "Recommended Fluids
and Lubricants" in the Index for the proper fluid to use.
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Check rear/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking.
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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
15,000 Miles (25 000 km)
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If Equipped: Replace passenger compartment air filter. If you drive regularly
under dusty conditions, the filter may require replacement more often.
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Check rear/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking.
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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
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in period. Change the rear axle fluid
DATE
ACTUAL
SERVICED BY:
MILEAGE
DATE
ACTUAL
SERVICED BY:
MILEAGE
7-9