GMC 2008 Envoy - Manual (Page 420)

When you go to your dealer/retailer for your service
needs, you will know that trained and supported service
technicians will perform the work using genuine parts.
If you want to purchase service information, see Service
Publications Ordering Information on page 7-16.
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 6-12 and Maintenance Replacement Parts
on page 6-14. 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
parts from your dealer/retailer.
Scheduled Maintenance
When the change engine oil light or CHANGE ENGINE
OIL DIC message comes on, it means that service is
required for your vehicle. See Change Engine Oil Light
on page 3-45 or DIC Warnings and Messages on
page 3-53. 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 dealer/retailer has trained service
technicians who will perform this work using genuine
parts and reset the system.
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 5-19 for information on the Engine Oil
Life System and resetting the system.
When the change engine oil light or CHANGE ENGINE
OIL DIC 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 light or
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 light or message comes
on 10 months or more since the last service or if the light
or message has not come on at all for one year.
6-4