Return & Exchange Policy
All sales of used auto parts are subject to this policy. By placing an order, you agree to these terms.
Small-parcel shipments (UPS, FedEx, USPS)
Damage, missing items, or incorrect parts must be reported to Miller 40 Parts within 48 hours of delivery with photos of the part, the packaging, and the shipping label. Reports made after 48 hours will be denied.
LTL / freight shipments (engines, transmissions, body panels, large items)
- Visible damage must be noted on the Proof of Delivery (POD) before signing. Signing “clean” or noting only “subject to inspection” forfeits the freight claim and waives any damage refund.
- Visible damage must be reported to Miller 40 Parts within 24 hours with the noted POD and photos.
- Concealed damage (not visible from the exterior) must be reported within 5 business days of delivery.
- The customer must retain the part and all packaging materials until the freight claim is resolved.
| Scenario | Treatment |
|---|---|
| Before shipment | Orders may be cancelled at no charge for a full refund or, for PO-based orders, cancellation of the open invoice. |
| After shipment | Orders cannot be cancelled and must be processed as returns under Section 3. |
| Refused delivery / undeliverable address | Refund = purchase price − 20% restocking fee − original shipping cost − return freight cost. |
| Special-order, custom-cut, or third-party-sourced parts | Non-cancellable once procurement begins. |
All returns require a Return Merchandise Authorization (RMA) number issued by Miller 40 Parts before shipping. Returns received without an RMA will be refused.
- Return window: 30 days from delivery date.
- Eligible for return: Standard mechanical and body parts in original condition with all Miller 40 Parts identification markings intact.
Each RMA issued by Miller 40 Parts follows this format:
Example: M40-RMA-26126-0042-D7
| Segment | Meaning |
|---|---|
| M40-RMA- | Fixed prefix identifying the document as a Miller 40 Parts RMA |
| 26126 | Issue date — 2-digit year (26) plus Julian day (126 = May 6) |
| 0042 | Daily sequence number |
| D | Return type code: C = customer error · D = defect claim · S = shipping damage / Miller 40 Parts error · R = refused delivery |
| 7 | Check digit validating the RMA format |
RMA validity rules
- The RMA must be clearly written or printed on the outside of the return package.
- The RMA expires 7 calendar days from the issue date. Returns shipped after expiration will be refused. A new RMA must be requested if the original expires.
- The return type code is fixed at issue and cannot be changed after the RMA is generated. If the stated reason changes, a new RMA must be requested.
- Only one active RMA may exist per order at any time.
- 1Contact Miller 40 Parts within 30 days of delivery to request an RMA. Include order number, reason for return, and supporting documentation per Section 3.4 if claiming a defect.
- 2Once approved, the customer ships the part back within 7 days of RMA issue using a tracking-enabled method, with the RMA number clearly visible on the outside of the package.
- 3The part is inspected on receipt per Section 4.
- 4If the return is approved, the refund or credit memo is processed within 5–7 business days of inspection (plus 3–5 business days for credit card posting where applicable).
| Return reason | Restocking fee | Return shipping | Original shipping refund |
|---|---|---|---|
| Customer error (ordered wrong part, found it elsewhere, no longer needed, doesn't fit due to buyer ordering without verification) | 20% | Customer pays | Not refunded |
| Miller 40 Parts error (wrong part shipped, listing description error, shipping damage confirmed within Section 1 windows) | None | Miller 40 Parts pays | Refunded |
| Defective part — defect confirmed on inspection | None | Miller 40 Parts pays | Refunded |
| Defective part claim — defect NOT confirmed on inspection | 20% (auto-reclassified as customer error) | Customer pays | Not refunded |
A claim that a part is defective requires more than a customer's statement. To open a defect claim, the customer must provide:
For mechanical parts (engines, transmissions, axles, alternators, starters, AC compressors, pumps, etc.)
- A diagnostic report from a licensed automotive repair facility identifying the specific failure mode (compression test, OBD scan codes with freeze-frame data, electrical resistance/voltage readings, leak-down test, or equivalent diagnostic appropriate to the part).
- Documentation that the part was installed by a licensed shop.
- Documentation that all required fluids, filters, gaskets, seals, and timing components (belts/chains) were replaced upon installation per manufacturer specification.
- The customer must notify Miller 40 Parts before any repair, removal, or further disassembly. Unauthorized work voids the defect claim.
For body parts and items where defects are visually verifiable
- Clear photos showing the specific defect (cracks, structural damage, missing material, etc.) that was not disclosed in the listing.
Defect claim process
- 1Customer submits documentation with the RMA request.
- 2Miller 40 Parts reviews the documentation. If documentation is insufficient, the claim is denied or downgraded to a standard customer-error return.
- 3Customer ships the part back per Section 3.2.
- 4Part is inspected on receipt per Section 4. If inspection confirms the defect, full refund or credit memo is issued including return shipping. If inspection determines the part is functional and the failure was due to misdiagnosis, improper installation, or buyer error, the return is automatically reclassified as a customer-error return: 20% restocking fee applies, customer pays return shipping, original shipping is not refunded.
Conditions that void defect claims
- Any disassembly, modification, painting, alteration, or attempted repair by the customer or a non-licensed party.
- Failure to replace fluids, filters, gaskets, seals, or timing components as required.
- Use in racing, off-road, commercial fleet, or competition applications.
- Damage from accident, abuse, misuse, or operation outside the part's design parameters.
- For engines/transmissions: opening, splitting, or modifying the block or case.
Every returned part is inspected on receipt. Outcomes are determined by inspection findings, not by the reason stated on the RMA.
| Inspection finding | Outcome |
|---|---|
| Part matches packout records and condition is consistent with packout photos | Return processed per Section 3.3 based on the stated reason. |
| Part matches but condition is degraded (install marks, fluid contamination beyond normal inspection, scratches or damage from buyer handling, missing accessory components that shipped with it) | Return is processed with an additional condition deduction of up to 50% of the purchase price, on top of any restocking fee, to recover the loss in resale value. |
| Part is the same type but Miller 40 Parts identification markings are missing, altered, removed, or obscured | Return is refused. The part is held for 14 days (small parts) or 30 days (engines, transmissions, and other large items) for pickup at the customer's expense. After the hold period, the part is disposed of. |
| Part is materially different from what was shipped (different OEM number, different vehicle application, different physical unit, different casting number, different VIN traceback) | Return is refused. No refund or credit memo is issued. The part is held for 14 days (small parts) or 30 days (engines, transmissions, and other large items) for pickup at the customer's expense. The customer is notified in writing with photos comparing the shipped part to the returned part. |
All Miller 40 Parts items are marked at intake with a unique identifier tied to the stock number and source VIN. Intake, packout, and return-inspection photos are retained on the order record. In any dispute over inspection findings, Miller 40 Parts' photographic, weight, and dimensional records of the part as shipped will be the basis for resolution.
The form of credit issued for an approved return depends on how the original order was paid.
Refunds are issued to the original payment method only. Allow 5–7 business days after inspection for processing, plus 3–5 business days for the credit to post to the cardholder's statement.
For orders placed against a Purchase Order with Net-15, Net-30, or other terms, returns are processed as credit memos rather than cash refunds. Two scenarios apply:
- Open-invoice credit memo. If the invoice has not yet been paid, the credit memo is applied directly against the open invoice. If the credit memo equals the invoice amount, the invoice clears to zero.
- Applied credit memo. If the original invoice has already been paid, the credit memo is recorded against the customer's account and applied to the next invoice(s) until the credit is exhausted.
- Cash conversion. If no further orders are placed within 90 days of credit memo issuance, the customer may request conversion to a check refund. Cash conversion is granted at Miller 40 Parts's sole discretion and may take up to one full AP cycle to process.
Restocking and condition deductions are reflected as a reduced credit memo amount, not as a separate line item. For example, a return on a $1,000 part with a 20% restocking fee results in a credit memo for $800.
The following are sold as-is and are NOT eligible for return for any reason other than confirmed shipping damage reported within the windows in Section 1:
- Electrical parts: ECMs, BCMs, TCMs, alternators, starter motors, sensors, ignition components, modules, wiring harnesses, switches.
- Sheet metal, glass, body panels, bumpers, fenders, doors, hoods, decklids and tailgates — sold as-is; color match not guaranteed; expected to be repainted on installation.
- Catalytic converters and exhaust components.
- Tires, wheels, fluids, gaskets, seals, filters.
- Parts that have been installed, attempted to be installed, modified, painted, disassembled, or altered in any way.
- Parts where Miller 40 Parts identification markings have been removed, damaged, or are missing (subject to Section 4.1 extraordinary-case discretion).
- Special-order or third-party-sourced parts procured for the customer outside of Miller 40 Parts' standing inventory.
- Parts under $10 in value.
Miller 40 Parts does not currently offer an express written warranty on parts. All parts are sold as-is, with the sole exception of the 30-day defect-claim window described in Section 3, which provides recourse for parts that arrive non-functional or fail within 30 days of delivery despite proper installation.
Implied warranties under applicable state law are limited to the maximum extent permitted by law and, where permitted, to a duration not exceeding 30 days from delivery.
- Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation may not apply to you.
- Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.
- This policy gives you specific legal rights, and you may also have other rights which vary from state to state.