Hummer 2004 H2 Owner's Manual page 431

When the CHANGE ENGINE OIL light 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.
Change engine oil and filter. Reset oil life system. See Engine Oil on
page 5-14. An Emission Control Service.
Lubricate chassis components. See footnote #.
Visually check for any leaks or damage. See footnote (j).
Inspect engine air cleaner filter. If necessary, replace filter. See Engine Air
Cleaner/Filter on page 5-19. An Emission Control Service. See footnote †.
Rotate tires and check inflation pressures and wear. See Tires on page 5-60.
Inspect brake system. See footnote (a).
Check engine coolant and windshield washer fluid levels and add fluid as
needed.
Perform any needed additional services. See "Additional Required Services" in
this section.
Maintenance I — Use Maintenance I if the CHANGE
ENGINE OIL light comes on within ten months since
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 comes on ten months
or more since the last service or if the light has not
come on at all for one year.
Scheduled Maintenance
Service Maintenance I Maintenance II
6-5