I have a 10+ years of experience in building auto financing services in Russia: leasing, car loans, insurance, additional services.
I believe a car is repaired like once per year on average and a customer would be looking for a repair shop only for two weeks in a year.
That means that only 1/26 of the listeners will be "open" to your ad, the rest will just forget it.
I would suggest a more direct way of approaching the customers with an active need. They search for 'car shop' on google - google ads, they may visit car parts stores - affiliate marketing. I would also suggest calling/e-mailing last year's customers to schedule a regular check-up.
I had worked with Alexey more than 4 years before I left Europlan. I met many people but so far Alexey is the only person with the unique quality of having strong emotional intelligence, perfect logic, and great sense of humor at the same time.
Active and positive thinking specialistб ready to help the market find the right way of developement.