Seeing how dunking your car in a large vat of oil is impractical, our next suggestion would be to have your car inspected on a "rack" that you drive onto that lifts the wheels, not the frame. (This style of lift or rack can usually be found in a service center that does muffler replacements.) This will allow you to move or "work" the suspension while safely checking for the location of the noise. Look at the pivot points of the suspension. They have rubber bushings that can fail.
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2004 E60 530is, Delivered 12/12/03, TiSilver/LGrey, PP, SP,PS, PDC, ACC, FRS, Step, Xenons, clear bra, body colored rear inserts. (Retired, 1983 henna red 320is)
2004 Corvette Z06 Commemorative Edition