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

Accessories and ModificationsChevrolet Cobalt Service & Repair Manual. Engine Oil Light, Diagnosis & Testing
1.
Understand and validate customer concern.
Inspect visible system components for obvious damage or conditions
that may cause concern.
2.
Inspect for related bulletins, recall/field
actions and preliminary information.
...