You know I have to agree with King and Ard on this one. I have a 2011 35d and while I notice a little of the diesel sound upon acceleration I also know it is MUCH quieter compared to other diesel vehicles. I knew what to expect when I test drove it and fell in love with that sound and it hasn't changed since I took delivery. I am not sure what you expected but I sure got what I expected which is a great running vehicle with kick @ss get up and go that looks great.

It is a little hard to decipher what you mean when you say "engine clatter". Is there a measurement you can provide??

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2011 x5 35d - Delivery Feb 28, 2011
Platimun Gray/Oyster Nevada Leather; Dark Bamboo Wood Trim; Cold Weather Pkg; Premium Pkg; Premium Sound Pkg; Rear Climate Pkg; Technology Pkg; Comfort Access; Multi-Contour Seats; Heated Rear Seats; Head Up Display; Roof Rails; Space Saver Spare Tire

2011 Infiniti G37x
Premium Package; Navigation Package; Interior Accents

2009 335i xDrive (Gone but not forgotten)
Sapphire Black/Oyster Nevada Leather
Cold Weather, Comfort Access, Logic7, Navigation