Not sure if i agree that the enigine compartment should be dirty..?!?!

I noticed the dust on the e53 as well, and for a BMW, im surprised the amount that accumulate in such a short time.

I used to own a E30, 325i -86, and on that one it was enough to clean it ones a year.. Hardly any dust comming in..

Considering the e53 is nearly 20 years younger i had expected more from it...