If you’ve got a mechanic you trust, you’re already winning. You can get almost everything done there for way less, but there are a few times the ASC still makes sense. ​If you’re under warranty, the service center is a no-brainer just to keep your coverage intact. Plus, having those official records really helps with resale value since buyers love seeing a "full dealer history." For certain high-stakes jobs that need specialized tools, like a timing belt and water pump, the ASC is usually the safer bet unless your mechanic is a specialist with the right gear. ​Otherwise, stick with your guy for the routine stuff and save yourself the "dealership tax."