The Association of Diesel Specialists is the worldwide diesel industry's leading trade association, dedicated to the highest level of service on diesel fuel injection and related systems. A.D.S. has over 700 corporate and individual members in the U.S., Canada, Mexico and more than 56 other countries.

The primary membership of A.D.S. consists of independent repair shops (Service Members) specializing in diesel fuel injection, governor and turbocharger service. Each Service Member is authorized by one or more of the Association's Manufacturer Members, which are original equipment (OEM) manufacturers of fuel injection equipment, governors, superchargers or turbochargers.

Other membership catagories encompass manufacturers and distributors of replacement parts and allied equipment, and post-secondary schools offering programs in diesel mechanic training.