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Chains also have larger staffs, so if a repair is a two man job or it's possible to speed up the car repair by adding extra mechanics to the job, the repair shop has the people to do the job. An assurance of quality is the second reason. Chains make certain that all their mechanics are licensed and certified. On top of that, having more mechanics at the shop means having more experience on hand to puzzle out obscure problems, and means it is more likely that you will get the services of someone who specializes in your car's type of problem. Convenience is the third reason.