I know most people like going for what seems cheaper, but sometimes you should just go with the dealership. The thing about backyard mechanics is that they can be not only shifty, but honestly outright crooked. My aunt got took for over 1700 dollars by someone she'd been going to for years - seems he has recently developed something of a drug habit. Furthermore you never know if they're just going to keep your car or even if they're really qualified to work on it. What's the point in having them "fix" it when it breaks down a week later. That said dealerships love to add on costs you don't need, and some of them are just as shady in their behavior. The only difference is that as a business they are rather a bit more liable and there are far more options to take when dealing with them. So I say go with the dealership most times.