What M&D Distributors makes and sells

Magneto & Diesel Injector Service, which trades as M&D Distributors and runs its online store as The Diesel Store, is a value-added distributor and remanufacturer of aftermarket parts for diesel-powered engines. The heart of the business is diesel fuel injection: injectors, injection pumps, and the tools to test and calibrate them. Around that core the company distributes and remanufactures cylinder heads, engine blocks, connecting rods, crankshafts, turbochargers, and filtration and emissions parts. Its own description puts the catalog at more than 100,000 new and remanufactured parts drawn from leading OEMs and aftermarket suppliers.

The company serves heavy-duty and high-horsepower diesel applications across trucking, agriculture, construction and infrastructure, marine, and general transportation, and it also handles light and medium-duty vehicles. It remanufactures fuel injectors, pumps, cylinder heads, and turbochargers using its own tooling and test systems, a build-and-rebuild profile rather than a pure parts reseller. Brand relationships it names include Bosch, Garrett, Cummins, Stanadyne, Holset, BorgWarner, Federal-Mogul, Parker Racor, and Baldwin Filters.

Ownership and history

The company was founded in 1943 as Magneto & Diesel Injector Service, started by the Ingram family near the Houston Ship Channel to repair magnetos and diesel injectors for the shipping and rail operators working Houston during the last years of World War II. It became an early remanufacturer of diesel injection components and grew across Texas over the following decades, later adding responsibility for Oklahoma and Louisiana.

Ownership has passed through two private-equity holders. Warren Equity Partners bought a majority interest from the Ingram family in December 2018, with the family reinvesting alongside and staying on the board. In September 2022, Gridiron Capital acquired M&D from Warren Equity and Monroe Capital. Under Gridiron the company has run an active acquisition program: it bought Thompson Diesel and Memo Corporation (MemoParts, a Deutz-engine remanufacturing specialist) in 2022, Taylor Diesel Group in December 2023 (its first locations in Tennessee, Arkansas, and Missouri), and Turbo Diesel & Electric and Seidel Diesel Group, plus DSS ProDiesel Partners, a Class 7 and 8 injector remanufacturer. The company says it has grown from 12 branches in 2021 to 33 branches, with a national footprint reaching beyond its Texas base into the Southeast, mid-South, and Midwest. It is headquartered at 7902 FM 1960 Bypass Road West in Humble, Texas, outside Houston.

Recent developments

M&D rebranded in 2022 to support its acquisition strategy and unify its family of companies, and it sells nationally through its e-commerce site, The Diesel Store. In August 2025 it announced that Turbo Diesel & Electric locations in Pelham, Alabama; Forest Park, Macon, and Marietta, Georgia; and Greenville, South Carolina would be converted to the M&D brand, extending a pattern of folding acquired remanufacturers into a single banner. For buyers, the practical read is a supplier that has consolidated a fragmented regional diesel-aftermarket sector into a multi-branch platform, which is relevant when weighing single-source coverage against nearshoring and multi-supplier strategies.

Sourcing evidence

M&D's direct US import record is small and consistent with a domestically focused distributor that buys most of its catalog through US channels and imports only select remanufacturing cores and components directly. US customs bill-of-lading records show 12 sea shipments under the Humble entity between July 2023 and September 2026, at an average of about 1.75 TEU per shipment, with the most recent shipment landing September 24, 2026, so the company is actively importing in the current year.

Five suppliers shown of five on record. By origin, 11 of the 12 shipments come from China and 1 from Taiwan. The declared goods are diesel engine hardware, cylinder heads, injectors, and related parts, the core reman inputs of a company that rebuilds and resells rather than one importing finished consumer goods. Customs-derived estimates put cumulative ocean shipping spend at roughly $27,000 across the recorded window, with cost data covering about 83% of shipments, an order-of-magnitude figure rather than an audited one.

Coverage caveats: these are US ocean-freight records only. Air, truck, and rail movements do not appear; some records name freight intermediaries rather than manufacturers; and product categories come from declared manifest codes, which are noisy. Most of a national distributor's inventory moves through domestic distribution and does not show up as direct imports, so the small direct-import count understates total sourcing activity. Absence of a record is not evidence of absence.

Frequently asked questions

What does M&D Distributors make?

M&D Distributors, legally Magneto & Diesel Injector Service, distributes and remanufactures aftermarket parts for diesel engines. Its core is diesel fuel injection (injectors and injection pumps), alongside cylinder heads, blocks, rods, crankshafts, turbochargers, and filtration and emissions parts. It lists a catalog of more than 100,000 new and remanufactured parts and sells online as The Diesel Store.

Who owns M&D Distributors?

M&D Distributors has been owned by the private-equity firm Gridiron Capital since September 2022, when Gridiron acquired it from Warren Equity Partners and Monroe Capital. Warren Equity had bought a majority interest from the founding Ingram family in December 2018. The company was founded in 1943.

Where is M&D Distributors headquartered?

M&D Distributors is headquartered at 7902 FM 1960 Bypass Road West in Humble, Texas, in the Houston metropolitan area. The company was founded in Houston in 1943 and now operates a national network of branches reaching from Texas into the Southeast, mid-South, and Midwest.

How many locations does M&D Distributors have?

The company says it has grown from 12 branches in 2021 to 33 branches. That expansion came through acquisitions including Thompson Diesel and Memo Corporation (2022), Taylor Diesel Group (2023), and Turbo Diesel & Electric, Seidel Diesel Group, and DSS ProDiesel Partners.

What brands and parts does M&D Distributors carry?

M&D carries new and remanufactured diesel parts across fuel injection, cylinder heads, blocks and rods, turbochargers, and filtration. Named brand relationships include Bosch, Garrett, Cummins, Stanadyne, Holset, BorgWarner, Federal-Mogul, Parker Racor, and Baldwin Filters. It serves trucking, agriculture, construction, marine, and general transportation.

Last verified September 28, 2026. Is this your company? Request a correction.