Cars are staying on the road for longer, and the people who drive them still need oil changes, brake jobs, diagnostics and the occasional big repair. It is no surprise that many first-time business buyers look at automotive service and wonder what it would take to open their own shop under a known name. The very first question is nearly always the same: how much does it cost? The honest answer is a range that depends on the brand, the building, the market and how much of the work you…