Mine does that on startup, i know with the E53s that was common to have the timing guides deteriorate and break. Dont know bout your though. With mine its some plastic pieces and i think the oil cap i lost (couldnt get it so just bought a replacement at AZ). Impropper lubrication usually causes some of these issues (most OTC oils, especially castrol are not full synthetic and really dont offer as good of protection as some assume) but with 7k miles not too sure. Follow propper break-in procedures and if i were you id get it looked at.

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Do your car and move up to Amsoil.