Doing Your Own Service Work; Adding Equipment To The Outside Of; Your Vehicle; Fuel - GMC Sierra Denali 2006 Owner's Manual

Doing Your Own Service Work

CAUTION:
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You can be injured and your vehicle could be
damaged if you try to do service work on a
vehicle without knowing enough about it.
•
Be sure you have sufficient knowledge,
experience, the proper replacement parts,
and tools before you attempt any vehicle
maintenance task.
•
Be sure to use the proper nuts, bolts, and
other fasteners. English and metric
fasteners can be easily confused. If you
use the wrong fasteners, parts can later
break or fall off. You could be hurt.
If you want to do some of your own service work,
you will want to use the proper service manual. It tells
you much more about how to service your vehicle
than this manual can. To order the proper service
manual, see Service Publications Ordering Information
on page 7-15.
Your vehicle has an airbag system. Before attempting to
do your own service work, see Servicing Your
Airbag-Equipped Vehicle on page 1-60.
5-4
You should keep a record with all parts receipts and
list the mileage and the date of any service work
you perform. See Maintenance Record on page 6-16.
Adding Equipment to the Outside
of Your Vehicle
Things you might add to the outside of your vehicle can
affect the airflow around it. This may cause wind noise
and affect windshield washer performance. Check with
your dealer before adding equipment to the outside of

your vehicle.

Fuel

Use of the recommended fuel is an important part of the
proper maintenance of your vehicle.

Gasoline Octane

Use premium unleaded gasoline with a posted octane
rating of 91 or higher. You may also use regular unleaded
gasoline rated at 87 octane or higher, but your vehicle's
acceleration may be slightly reduced, and you may notice
a slight audible knocking noise, commonly referred to as
spark knock. If the octane is less than 87, you may notice
a heavy knocking noise when you drive. If this occurs,
use a gasoline rated at 87 octane or higher as soon as
possible. Otherwise, you might damage your engine.
If you are using gasoline rated at 87 octane or higher and
you hear heavy knocking, your engine needs service.