GMC Yukon Owner's Manual page 336

I
Short Trip/City Maintenance Schedule
--
Gasoline Engines
1
9,000 Miles (15 000 km)
0
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.
12,000 Miles (20 000 km)
0
Change engine oil and filter (or every
3 months, whichever occurs first).
An Emission Con fro1 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.
**
DATE ACTUAL MILEAGE SERVICED BY: