From 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.
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
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
Doc's DieselFounded 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.BRYAN, OH
Stauffer Diesel IncFounded by Amos Stauffer in 1948 to serve Lancaster County dairy farmers, Stauffer Diesel has grown into a Pennsylvania-based distributor and service provider for industrial and marine diesel engines. The company keeps hundreds of new and replacement engines in stock while supporting them with repair, rebuilding, parts, and factory-trained field service. Its Stadco division also designs and manufactures custom generator sets and modular power packages for OEM applications.EPHRATA, PA