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 WarningRefrigerant Recovery and Recharging
Special Tools
GE-45037 A/C Oil Injector
For equivalent regional tools, refer to Special Tools.
Refrigerant Recovery and Recharging
Warning: To prevent personal injury, avoid breathing A/C Refrigerant
and lubricant vapor or mist. Work in a well ventilated area. To
remove refrigerant from the A ...
Rail Dust Damage Repair
Warning: Refer to Eye Protection Warning in the Preface section.
Note: If rail dust has penetrated into the basecoat, the panel
requires refinishing. Ensure all the rail dust has been removed prior to
refinishing or the rust spots will return.
Rail dust damage comes from the tiny iron particles ...
Reduced Engine Power Light
The reduced engine power light should come on briefly as the engine is started.
If it does not come on, have the vehicle serviced by your dealer.
This light, along with the malfunction indicator lamp, displays when a noticeable
reduction in the vehicle's performance occurs. Stop the vehic ...