Scheduled Maintenance - GMC Sierra Denali 2006 Owner's Manual

Owner Checks and Services on page 6-9 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 6-13 and Normal Maintenance Replacement
Parts on page 6-15. 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.

Scheduled Maintenance

When the CHANGE ENGINE OIL message comes
on, it means that service is required for your vehicle.
Have your vehicle serviced as soon as possible within
the next 600 miles (1 000 km). It is possible that,
if you are driving under the best conditions, the engine
oil life system may not indicate that vehicle service
is necessary for over a year. However, your engine
oil and filter must be changed at least once a year
and at this time the system must be reset. Your
®
GM Goodwrench dealer has GM-trained service
technicians who will perform this work using genuine
GM parts and reset the system.
6-4
If the engine oil life system is ever reset accidentally,
you must service your vehicle within 3,000 miles
(5 000 km) since your last service. Remember to reset
the oil life system whenever the oil is changed. See
Engine Oil Life System on page 5-15 for information on
the Engine Oil Life System and resetting the system.
When the CHANGE ENGINE OIL message appears,
certain services, checks, and inspections are required.
Required services are described in the following for
"Maintenance I" and "Maintenance II." Generally, it is
recommended that your first service be Maintenance I,
your second service be Maintenance II, and that you
alternate Maintenance I and Maintenance II thereafter.
However, in some cases, Maintenance II may be
required more often.
Maintenance I — Use Maintenance I if the CHANGE
ENGINE OIL message comes on within 10 months since
the vehicle was purchased or Maintenance II was
performed.
Maintenance II — Use Maintenance II if the
previous service performed was Maintenance I. Always
use Maintenance II whenever the message comes
on 10 months or more since the last service or if the
message has not come on at all for one year.