Core Policy

Many stock replacement parts such as turbos, injectors, injection pumps, and high pressure oil pumps have a core charge that is associated with the new replacement part. You must return the old part to receive a refund on the core charge.

• In some cases, the core is not reusable, such as in the event of a cracked case, at which point the core deposit would not be credited as the core component is not reusable.
• Cores that have been disassembled and/or have missing and/or damaged major components will not receive full core credit.
• Returned cores must be on a "like-for-like" basis, meaning that the returned core has the exact same fitment as the remanufactured component that was purchased. If the core is not "like-for-like," your core may not be eligible for return/credit.
• You are responsible for core return shipping cost.

1. Please keep all original packaging of your new item to be used for the core return.
2. Drain all fluids: oil, fuel, etc. out of the core before it is returned.
3. Place any plastic plugs or caps received on the new item back onto the core.
4. To insure UPS, Fed Ex, or USPS will not reject the package due to fuel or oil leakage, please wrap the core in a plastic garbage bag.
5. Place core inside the box.
6. If core return paperwork was inside the box, please complete the form and send back with the core.
7. Please provide a tracking number to sales@underdog-diesel.com . Without a confirmed tracking number we cannot guarantee your core refund

If you are unsure where to send your core, email us at sales@underdog-diesel.com with your order number. 

• If the core is returned after 30 days, 90% of the core will be refunded.
• If the core is returned after 60 days, 70% of the core will be refunded.
• If the core is returned after 90 days, 50% of the core will be refunded.
• After 6 months cores will be accepted at UnderDog's discretion.