1234, Main Street
Boston, MA 02123
01 April, 2005
<Recipient Address Goes Here>
I brought my [car name, year etc.] to [Repair location] for [Specify Repair]. I was helped by [Mechanic name] there and I want to say that he really did a good job.
I really thank him for doing a wonderful job on my vehicle.
Nowadays, it is very common to find auto repair stores that take advantage of their customers and do not provide value for their money, but coming across such a great service really makes me feels good.
I am really satisfied with your services and I want to tell you have got a permanent customer for your workshop.
encl: <List of enclosed items goes here>