I used to work with a mechanic that did this and even now I own a site that collects requests in an east coast city and forwards them to some local mechanics I have an arrangement with. It's a great idea and people absolutely love it. Every tool needed is in the mechanics mobile shop, usually an outfitted van, and even fluid collection and disposal is not an issue. The problem is permits and insurance. These expense take a nice chunk out of any margin you have set up that keeps your prices competitive. The other issue is scaling. Mechanics will not work for per-job pay, they all want hourly. Putting a crew with a mobile unit on standby and waiting for a job is very inefficient if you have to pay them while they wait. While YM may have figured out how to make it scale as one large organization, it would be much better to build a marketplace where qualified independent mechanics compete for jobs as they come in, with work certified and backed by YM - like the Uber model.