The median annual wage for diesel service technicians and mechanics was $42,320 in May 2012. The median wage is the wage at which half the workers in an occupation earned more than that amount and half earned less. The lowest 10 percent earned less than $26,820, and the top 10 percent earned more than $63,250.%. Employment of diesel service technicians and mechanics is projected to grow 9 percent from 2012 to 2022, about as fast as the average for all occupations. As more freight is shipped across the country, additional diesel-powered trucks will be needed.