Chevrolet 2007 Colorado Owner's Manual page 443

When the CHANGE 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.
Change engine oil and filter. See Engine Oil on page 333. Reset oil life system.
See Engine Oil Life System on page 336. An Emission Control Service.
Visually check for any leaks or damage. See footnote (g).
Inspect engine air cleaner filter. If necessary, replace filter. See Engine
Air Cleaner/Filter on page 338. See footnote (j).
Rotate tires and check inflation pressures and wear. See Tire Inspection
and Rotation on page 390 and "Tire Wear Inspection" in At Least Once
a Month on page 448.
Inspect brake system. See footnote (a).
Check engine coolant and windshield washer fluid levels and add fluid
as needed.
Maintenance I — Use Maintenance I if the
CHANGE 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.
Scheduled Maintenance
Service Maintenance I Maintenance II
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