Called the local buick dealer to make an appointment to assess my car, I was told it would be 3 weeks before they can look at it! I told the service manager it was ticking and rattling and other problems and he sat quiet on the phone for a spell. He then said well if it's gets worse you can bring it in and leave it here a few days maybe we can get to it. Is this normal? 3 weeks before they can diagnose my car?