Do not add anything to the oil. The recommended oils with the dexos specification and displaying the dexos certification mark are all that is needed for good performance and engine protection.
Engine oil system flushes are not recommended and could cause engine damage not covered by the vehicle warranty.
Selecting the Right Engine Oil
What to Do with Used OilOnStar Description and Operation
This OnStar® system consists of the following components:
Telematics communication interface control module
OnStar® three button assembly
Microphone
Cellular antenna
Navigation antenna
Bluetooth® antenna (If equipped)
Back up battery (If equipped)
This system also interfaces wi ...
Rear Compartment Lid Rear Hinge Replacement
Rear Compartment Lid Rear Hinge Replacement
Callout
Component Name
Preliminary Procedures
Remove the rear window trim panel. Refer to Rear Window Panel Trim
Replacement.
Remove the rear compartment lid. Refer to Rear Comp ...
Windshield Washer Solvent Container Filler Tube Replacement
Windshield Washer Solvent Container Filler Tube Replacement
Callout
Component Name
Preliminary Procedure
Open and support the hood assembly.
Grasp the top portion of the windshield washer container filler
tube and rotate t ...