Apply for your GCL Core Return using this form
Please try to provide as much information as possible to ensure a smooth and quick turnaround. DO NOT send any parts for core return without getting a Return Core Authorization (RCA) number from GCL Diesel. Cores MUST be returned in the original box to be eligible for credit.
Our promise to you: The information you supply to us will not be sold or provided to outside agencies. It will only be used to enable GCL Diesel to serve you, our customer, better. For more details, read our privacy policy.