GMC 2004 Yukon XL Owner's Manual page 508

CAUTION:
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Performing maintenance work on a vehicle
can be dangerous. In trying to do some jobs,
you can be seriously injured. Do your own
maintenance work only if you have the
required know-how and the proper tools and
equipment for the job. If you have any doubt,
see your GM Goodwrench dealer to have a
qualified technician do the work.
Some maintenance services can be complex. So,
unless you are technically qualified and have the
necessary equipment, you should have your GM
Goodwrench dealer do these jobs.
6-4
When you go to your GM Goodwrench dealer for your
service needs, you will know that GM-trained and
supported service technicians will perform the work
using genuine GM parts.
If you want to get service information, see Service
Publications Ordering Information on page 7-11.
Owner Checks and Services on page 6-11 tells you
what should be checked, when to check it and what you
can easily do to help keep your vehicle in good
condition.
The proper replacement parts, fluids and lubricants to
use are listed in Recommended Fluids and Lubricants
on page 6-14 and Normal Maintenance Replacement
Parts on page 6-16. When your vehicle is serviced,
make sure these are used. All parts should be replaced
and all necessary repairs done before you or anyone
else drives the vehicle. We recommend the use of
genuine GM parts.