I have now set up a youtube account where I can upload some videos of the noise. There are a total of 7 videos that start from the the noise not being present when backing out of the garage and noise when I return along with the following day. Youtube is not allowing me to upload all of the videos during one session but I am uploading as allowed. Please send your thoughts regarding this issue. Thanks again for everyone's reply. I just don't want to drive it anymore until I am confident that this will not harm my engine. Cheers! [ http://youtu.be/LJEQGsIkEC8 ]