Any business or company has a personality just like people have personalities. The personality of a shop will come primarily from the owner or proprieter.
And some of them are awful personalities.
Have you read the book Gung Ho? Great book. Great message.
Briefly, for the employees, set worthy goals and values, work together in an atmosphere of open information- no secrets, and cheer each other on. I think a perfect business would make the customers part of this process.
There are so many auto businesses out there that have screwed over so many customers that it will take years to build the trust that you will need. Some people have done it though. You can too. Just remember to keep good ethics at the top of your value's list, even when the electric and rent bills are overdue. Good Luck! I think you have a worthy idea.