Merchant Automotive currently has zero active public promo codes tracked by SimplyCodes, and its historical record shows just a single 20% off code surfacing over the past two years. That scarcity shifts the savings math toward policy-based paths: a 5% military discount claimed by phone on branded products, a strict 30-day core return window for full refunds, and a 20% restocking fee that punishes unverified fitment. The highest-leverage move for most shoppers is knowing which policy protects the most money before ordering remanufactured Duramax and Allison parts.
Military Members Get 5% Off Merchant Automotive Branded Products by Phone
Active-duty service members, veterans, and retired military personnel qualify for a 5% discount on all Merchant Automotive-branded products, according to Merchant Automotive's official military discount policy. This discount does not apply automatically at online checkout, so ordering through the website will cost eligible buyers the full amount.
To claim it, call the Merchant Automotive sales team at (616) 772-9551 to place the order directly. Buyers provide one-time proof of service, which can include a military ID, a retired military ID, or a DD-214. Because the 5% applies specifically to Merchant Automotive-branded items rather than every product carried, confirming that your target part falls under the house brand before calling ensures the discount actually applies to your cart.
Merchant Automotive Public Codes Are Nearly Nonexistent: 0 Active, 1 Tracked in Two Years
SimplyCodes tracks 0 active healthy codes for Merchant Automotive, and historical data shows only one code, offering 20% off, appeared across the entire last two years. Shoppers waiting for a sitewide coupon to materialize are effectively waiting on an event that has happened once since 2023.
That single 20% code was tracked in December 2025, according to SimplyCodes historical data. The practical takeaway for anyone shopping a Merchant Automotive-branded part is that the military discount and core refund timelines will almost always outperform any coupon hunt, since public codes for this merchant do not reliably exist.
Return Your Old Core Within 30 Days for a Full Merchant Automotive Refund
Merchant Automotive issues full core refunds only when the old core returns within 30 days of delivery, according to the company's official core return policy. Remanufactured parts that carry a core charge tie real money to that deadline, and missing it downgrades or erases the refund entirely.
Within the 30-day window, contact customer support at (616) 772-9551 or support@merchant-automotive.com to obtain a Return Material Authorization (RMA) number, and ship the core back in its original packaging. Cores returned between 31 and 90 days after delivery are eligible for store credit only. After 90 days, Merchant Automotive issues no refund and no store credit, so the core charge becomes a permanent cost. Pulling and shipping your old core the moment the reman part is installed is the surest way to recover the full charge.
Verify Fitment Before Ordering to Avoid Merchant Automotive's 20% Restocking Fee
Approved standard returns at Merchant Automotive carry a 20% restocking fee, according to the company's official shipping and returns policy, which turns an ordering mistake into a direct financial penalty on expensive automotive parts. On a wrong part, that fee is money lost with nothing to show for it.
Merchant Automotive accepts returns on most new, unopened items within 30 days of delivery, but every return requires an officially issued RMA number first. Packages sent back without an RMA are not processed or refunded, meaning an unauthorized return can cost the entire purchase price rather than just the restocking fee. Confirming your vehicle's compatibility or calling the sales team at (616) 772-9551 to verify fitment before finalizing the order avoids the 20% penalty altogether.
