right now i use a friend who use to be a dealer mechanic

there are a few locally owned mechanic shops where i live that have several locations around town that have solid reputations. i figure they must be doing something right to grow their business like that.

and of course checking out google/apple maps reviews can give a feel for their reputation.

one way to get a feel for a shop is to get an oil change and see how the interaction feels. that's how i found a place i trusted, expensive (standard rates) but trustworthy