GMC Yukon Owner's Manual page 348

I
Short TriplCity Maintenance Schedule
--
Gasoline Engines
I
63,000 Miles (105 000 km)
0
Change engine oil and filter (or every
3 months, whichever occurs first).
An Emission Control Service.
Lubricate chassis components; see footnote #
(or every 3 months, whichever occurs first).
El
Check readfront axle fluid level and add
fluid as needed. Check constant velocity
joints and axle seals for leaking.
**
66,000 Miles (110 000 km)
Change engine oil and filter (or every
3 months, whichever occurs first).
An Emission Control Service.
0
Lubricate chassis components; see footnote
##
(or every 3 months, whichever occurs first).
0
Check readfront axle fluid level and add fluid
as needed. Check constant velocity joints and
axle seals for leaking.
**
Rotate tires. See "Tire Inspection and Rotation"
in the Index for proper rotation pattern and
additional information. During tire rotation,
check brake calipers for freedom of movement.
Refer to the appropriate GM service manual for
proper caliper service procedures.
DATE SERVICED B Y ACTUAL MILEAGE
7-20