Oddly enough I've noticed mine getting louder and thought it was because of the colder temps we suddenly had. But then reading JCL's post it made sense to me because I had been getting my diesel at the cut rate truck stop for months and thought I was losing my mind. My last tank I went to my local Chevron (it was .05 cents a gallon more) and now it doesn't seem so noisy to me.

Overall when I'm tootling down the road I like the sound of my diesel. At first I didn't, but it has grown on me. Sure there is something slick about a gas BMW engine spinning up (my old 4.4i V8 for instance)... I actually had a friend riding with me to go skiing this weekend and after the trip when I got diesel she said 'this is a diesel?... I wouldn't have known"....so go figure.

I didn't drive an X35d before I bought it, my only experience was with a 335d and there is a difference between the 2 in sound. But happy I chose the torque monster over a 35i.

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2007 328i Sport, Monaco Blue
2011 X35D - sold -Space Grey
2004 X5 4.4i - sold - Kalahari Beige
2001 X5 3.0i - sold - Pearl Beige
2006 325i Sport, Sonora Beige
2000 323i - sold - Sienna Red