I'm in Dana's camp. I still own some gasoline-powered cars, but one day everything I own will be powered by veggie. I'm in the process of switching out engines in my 83 300D. I really don't think there was anything wrong with the engine that's in it now, but I got a donor car with only 125,000 miles on it and the tranny and engine in it are in perfect condition, so I just could not resist switching out engines and tranny. The tranny in my 83 300D is suspect. I'm definitely sold on the Mercedes diesels.
It's only been a 1 1/2 years since I found out how special diesel engines were. My wife tells me when I jump into something that I definitely jump into with both feet.
Dana, I see the 300 is next on your list. I should be starting my conversion in the latter part of March. Hope to have it finished for summer vacation.