Myself and several people I know have had major problems with their automotive-service department.
1. I took my car in for an oil change and air filter replacement. Later in the week, I noticed a strong exhaust smell in my car. I looked in my air filter compartment and saw that they had removed my old filter, but had not replaced it! Fortunately, I caught this early before any major damage could have been done to my engine.
2. A coworker of mine dropped her truck off for an oil change, and two hours later got a phone call from the service-department telling her they had broken off her dip-stick and couldn't get it out. They had the nerve to ask her "What would you like us to do?". Idiots.
I will never go back.