I have been a satisfied customer of Diablo Auto Specialists for seven years. Tim, the owner, is polite, friendly, and easy to work with. He explains my options and makes suggestions, and listens to my concerns. On the few occasion that I have had a problem, Tim has quickly resolved it. I have found Tim and his staff to be competent and professional. The prices are fair, and I believe that they always do the work that they charge for unlike some car dealership service departments, with which I have had problems in the past.