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 WarningRestraints
Specifications
Module Power, Ground, and MIL
Front Impact Sensor, Retractors, and Driver/Passenger Air
Bags
Side Impact Sensors and Side/Roof Air Bags
Air Bag Indicator and Disable Switch (C99)
...
Installation Procedure
Align the rocker inner panel.
Clean and prepare the attaching surfaces for spot welding.
Apply structural adhesive to all attaching surfaces.
Position the rocker inner panel on the
vehicle.
Verify the fit of the quarter outer panel
Clamp the rocker inner panel into posi ...
Engine Coolant
The cooling system in the vehicle is filled with DEX-COOL engine coolant. This
coolant is designed to remain in the vehicle for 5 years or 240 000 km (150,000
mi), whichever occurs first.
The following explains the cooling system and how to check and add coolant when
it is low. If there is a ...