GMC 2009 Sierra - Manual (Page 432)

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 SOON 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, the 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 5-16 for information on
the Engine Oil Life System and resetting the system.
When the CHANGE ENGINE OIL SOON 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 SOON 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.
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