Dude. Seriously? Calling the new BMW diesels gruff is just being crass. It's a diesel. Saying it's a bit gruff compared to a petrol is nonsense and like saying that the clouds are a bit white compared to the sky. Besides, Direct Injection petrols sound every bit as gruff as a diesel nowadays. The new 30D is one of the very finest diesel engines I have ever heard and sounds way better than most petrol engines. is it as subtle as the equivalent 3 litre petrol from BMW? Of course not! But calling it gruff ... it's like saying that a really pretty girl is gruff compared to a supermodel or something