Automotive specialists are skilled in various aspects of vehicle repair and maintenance. This may include diesel engine repair as well. Whether it’s a technician that is only doing C-tech level checks or complete engine or transmission overhauls. Diesel mechanics may be required to work on specialized equipment, tractors, trailers, rollers, loaders, sweepers, pick-up trucks, and other major pieces of equipment. Both automotive and diesel mechanics analyze, troubleshoot, diagnose and repair defective equipment.