Do you think it is coming from the intake valve are of the motor? I just picked mine up this morning after picking it up the day before for something another problem. On the way home on a stop light, I heard rattling noise. The minute I got home, I opend the hood and sure enough there is rattling noise.

I just picked up the X5 from the dealer this morning and they replaced the Disa Valve. They said if that is not replaced a pin comes lose and it rattles in the intake. If left alone, it will soon fall into the engine and destroy it.

I don't know if that's your case but might be work a try!

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'04 BMW X5 3.0i TitanSilber Metallic
'03 Lexus GX470 Black Onyx
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'03 BMW X5 3.0i Black Sapphire SOLD