Because of their efficiency and durability, diesel engines have become the standard in powering trucks and buses, and that means there will always be a demand for diesel engineers. Other heavy vehicles and mobile equipment, including bulldozers and cranes, also are powered by diesel engines, as are many commercial boats and some passenger vehicles. Diesel technicians also use a variety of power and machine tools, such as pneumatic wrenches, lathes, grinding machines, and welding equipment.  Diesel engine maintenance and repair is becoming more complex as engines and other components use more electronic systems to control their operation. In most shops, workers often use hand-held or laptop computers to diagnose problems and adjust engine functions.

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