Median annual wages nationally of automotive service technicians and mechanics were $40,710 in May 2018. The lowest 10 percent earned less than $23,420, and the highest 10 percent earned more than $66,950 annually. Many experienced technicians employed by automobile dealers and independent repair shops receive a commission related to the labor cost charged to the customer. Under this system, weekly earnings depend on the amount of work completed.
Bureau of Labor Statistics, https://www.bls.gov/ooh/installation-maintenance-and-repair/automotive-service-technicians-and-mechanics.htm