I have an appointment to take my Regal in on thursday due to the "Diesel sound coming from the engine". I have only had the car 3 weeks now and the sound has become louder. I was backing up slowly and it really rattled/ticked made me very nervous and embarrassed. My father first brought it to my attention the first day he saw the car. I was backing out and he ran out to tell me it's making a strange ticking noise. I hope they fix it because there are no check engine lights on.