For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningTowing the Vehicle
Notice: Incorrectly towing a disabled vehicle may cause damage. The
damage would not be covered by the vehicle warranty. Do not lash or hook to the
chassis components including the front and rear subframes, suspension control arms
and links during towing and recovery of a disabled vehicle or t ...
Removal Procedure
Warning: Refer to Approved Equipment for Collision Repair Warning in the
Preface section.
Warning: Refer to Glass and Sheet Metal Handling Warning in the Preface section.
Disable the SIR System. Refer to SIR Disabling
and Enabling.
Disconnect the negative battery cable. Refer to Batter ...
OnStar Additional Information
Transferring Service
Press to request account transfer
eligibility information. The Advisor can assist in canceling or removing account
information. If OnStar receives information that vehicle ownership has changed,
OnStar may send a voice message to the vehicle, requesting updated account i ...