I have an 18 month old E class (W211) with only about 10,000 on the clock but getting more transmission noise over past 500 miles, seems to be getting louder to the point where it is bugging me.

Distinct "whoooooo" noise especially when pulling away which then becomes a steady low pitched whine. I know that some transmission noise will always be there in any car but I have a Toyota truck which is now more silent than the Mercedes.

Dealer says nothing wrong with it but I think they just put it on a diagnostic machine and did not do a test drive.

Otherwise drives OK although possible that some shifts are a little more coarse than they were but frankly I cannot tell any more.

Before I go back to the dealer on the warpath, anybody have any experince of this or suggestions?