Nope! (in case you weren't joking!) WD40 would most definitely NOT be a good idea. If anything, the prob may be due to too much dust/grime/(wd40?) in the disc chamber. If it uses an optical sensor (light beam) to tell if the disc is in/out and it has got dirty (do you smoke in the car? that's always a good source of particles) that could be the source of your problem. Local car hi-fi shop for a strip-down, clean and overhaul might be the best choice.
Xernius, July 2004