M&D Distributors is a one-stop aftermarket distributor of mission-critical diesel engine parts and filtration products from leading OEMs and aftermarket suppliers headquartered in the city of San Angelo, Texas. The company has been providing quality parts and services for diesel end markets, including light or medium-duty vehicles, heavy-duty commercial trucks and industrial equipment since 1943. M&D has led the diesel aftermarket in remanufacturing and parts distribution for the past 80 years.