Problems with brand new X5 40d engine

[MVDS]

I have recently purchased a full spec 40d X5 (twin turbo 3 litre diesel). I am based in Sydney Australia so the on road price tag was amost $150k (thats over $150k USD these days) but anyway that is not my gripe.

After a day or so I noticed a strage metallic whirring (almost wheezing) sound under acceleration at around 2300 rpm. I have had it back to the dealer twice in its first two weeks since pickup (once they held it for 4 days). They acknowledge the sound but cannot fault the car nor can they find a same spec 40d to compare it against because they are quite new and rare in Australia.

Now the problem is getting worse and can be noted on deceleration and slightly under acceleration at 3500rpm.

The car also runs extremely hot and the fan can remain on for up to an hour after the car has been shut down. The heat from the engine could comfort a small city in the depths of winter!

BMW are not doing anything about this and I am bitterly unhappy because I now have a brand new car with less than 1000 kms that sounds like a broken Hyundai.

Does anyone have any insight as to what this might be or any suggestions as to how I might go about indentifying/fixing it?

Many thanks.

PS This is my 3rd diesel X5 so I am familiar with the general characteristics of the X5 diesel engines.