Earnings

Median annual wage of diesel service technicians and mechanics was $40,850 in May 2010. The lowest 10 percent earned less than $26,550. The top 10 percent earned more than $60,830.

Many diesel mechanics, especially those employed by truck fleet dealers and repair shops, receive a commission in addition to their base salary.

Source: U.S. Department of Labor Occupational Outlook Handbook, 2012-2013 Edition (http://www.bls.gov/oco/)