Originally Posted by a burrito
i wonder what the bmw diesel engine sound like
Not very good compared to 6 cilinder gasoline powered cars (like the 335i for example) but very acceptable (certainly for a diesel). And it's very quit aswell, so if you play loud music in your car you barely hear the engine.
Here's a review by Autospies, in wich everyting about it is very well explained.
I have a 335d and I'm very satisfied about it.