I go to Dynamic Auto in Fountain Valley.
Son is the owner/mechanic, and he's very professional and approachable. Helped save me thousands of dollars from stealerships by diagnosing my problems correctly.
Honest diagnostics and pricing. Recommendations are direct.
It's in a mechanics' lot behind a car wash. Several mechanics in the facility, but he's a little tiny shop in the middle. He's serviced many CL members, and praised by them.