For mechanic businesses, Google Ads is a great choice to reach customers actively searching for mechanic and auto repair services. With Google Ads, you can display ads based on specific keywords, locations, and demographics. Facebook Ads is also a good platform, as it provides powerful targeting capabilities, allowing you to reach a specific audience based on their interests, demographics, and behaviours. Also, consider using local advertising platforms like Yelp Ads or Angie's List to target customers looking for local mechanic businesses.