Disc Noise
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
Although CD technology is capable of providing some of the most noise-free audio listening available today, noise may still be introduced in certain ways. Address concerns of background noise by first examining the listener's disc for dirt, scratches, dust, or fingerprints on the top and especially on the bottom (side opposite the label) surface.
Some noise may be attributed to the recording technology. While a clean, well-kept disc should not introduce any new noise during play-back, the sound quality is only as good as the original recording. For example: many "Oldies" are recorded on CD's with AAD technology and some limitations of early recording equipment and techniques can be heard during playback.