GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 549

Maintenance I — Use Maintenance I if the CHANGE
ENGINE OIL SOON message displays within 10 months
since the vehicle was purchased or Maintenance II
was performed.
Change engine oil and filter. See Engine Oil on page 5-17. Reset oil life
system. See Engine Oil Life System on page 5-20. An Emission Control
Service.
®
Allison Transmission
maintenance service performed on the vehicle.
Lubricate chassis components. See footnote #.
Visually check for any leaks or damage. See footnote (j).
Inspect engine air cleaner filter or change indicator (if equipped). If necessary,
replace filter. See Engine Air Cleaner/Filter on page 5-22. See footnote (p).
Rotate tires and check inflation pressures and wear. See Tire Inspection and
Rotation on page 5-84 and "Tire Wear Inspection" in At Least Once a Month
on page 6-12.
Scheduled Maintenance
Service
only: Replace external transmission filter at the first
Maintenance II — Use Maintenance II if the previous
service performed was Maintenance I. Always use
Maintenance II whenever the message displays
10 months or more since the last service or if the
message has not come on at all for one year.
Maintenance I Maintenance II
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6-5