Founded in 2020 in small-town Ohio, Doc’s Diesel designs and sells replacement maintenance parts for diesel and gas trucks, with a particular focus on OEM-grade filters and fitment-specific service kits. The company grew from founder Max Nihart’s frustration with dealership pricing and hard-to-find parts, and now operates from a 42,000-square-foot warehouse serving customers across all 50 states. Its filters are designed to meet or exceed OEM standards and undergo third-party testing for filtration efficiency and flow rate.
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Diesel ProFrom a farmhouse basement in Glen Rock, Pennsylvania, Diesel Pro has grown into a family-owned diesel parts remanufacturer, distributor, and repair operation serving customers across the United States and Canada. Founded by Lance Donaldson in 1985 and now managed by his son Scott, the company remanufactures fuel-system components and turbochargers while running a full-service truck repair facility with 11 bays. Its 30,000-square-foot warehouse holds more than 100,000 parts, giving the long-standing local business an unusually broad reach.GLEN ROCK, PA
Diesel USA Group, IncDiesel USA Group traces its roots to Diesel Injection Service, founded in Louisville in 1950, and is now a multi-location company serving diesel equipment owners across North America. It is known for combining a neighborhood parts-counter approach with the inventory and technical reach of a larger operation, supporting customers in vehicle, industrial, locomotive and marine applications. The group distributes genuine diesel components and provides repair support for customers seeking to reduce downtime and maintenance costs.CINCINNATI, OH
D&J Precision MachineFrom its Ohio shop, D&J Precision Machine builds and remanufactures Cummins diesel engines and precision performance components for trucks, racers, and professional installers. Founded by Drew Pumphrey from a passion for diesel performance, the company manufactures selected parts in-house—including its X-BEAM billet rods and tool-steel wrist pins—and develops engine builds that balance high horsepower with everyday reliability. D&J is headquartered in Cambridge and is part of the Burnout Brands group alongside BD Diesel and Monster Transmission.CAMBRIDGE, OH
Enterprise Engine PerformanceSince 1987, family-owned Enterprise Engine Performance has repaired and rebuilt diesel pickup engines at its Thornville, Ohio shop, pairing a service department with an in-house machine shop. Its mechanics and machinists handle everything from minor repairs to complete overhauls, including custom engine and driveline setups for pulling and drag trucks. The company also supplies rebuild kits and diesel parts for Cummins, Duramax, and PowerStroke applications.THORNVILLE, OH