Obviously if it is that loud it is not normal

 

after replacing trans fluid, its better, although very slightly.

 

I think I have the same sound. The only time it makes noise is at an idle. It isn't loud enough to hear if the car is moving so I don't if it does it then. I had a transmission guy I trust listen to it and he said it was the transmission input shaft. The throw out bearing only makes noise when the clutch is in.

 

Good that you have warranty. What you describe sounds like a noisy bearing.
I've included a pic of some good helicopter noise for comparison

 

No necessarily true, none of the gears in the tranny should be moving when at a stop. Not event the main shaft. So there should not be any tranny noises when the car is not moving and out of gear.

In your case I would slowly push up and down the clutch pedal to see if the tone changes, I suspect your throw out bearing is bad and riding on the pressure plate.

 

Thanks for the view, but i have to say that girl has no ass

 

I hear a rattling noise when the car is at operating temperature sitting at idle. I have an automatic. If I place the car in neutral or park the sound goes away. The transmission performs without any trouble. Something loose down there maybe?

 

I have a '08 535i 6-speed. It has done that exact same thing since new. I describe mine as "gear rattle"....and mine seems to disappear when you turn on the A/C...as well as when you press in the clutch. It has not gotten any better or worse since new. I took it to the dealer about several times. They said it's normal..."they all do this". As much as I don't like that answer...I actually think they are right. I've heard of several others who have the same problem. In fact, I posted about it on here about 2 years ago, and there was just a post about it a few days ago. Also, most of my manual transmissions in the past did the same thing...to varying degrees...my '95 525i 5-speed did it...not as loud though. Bottom line for me....I'm not worried about it.