Mercedes W123s are considered to be the best of all automobiles for conversion to biodiesel (SOLID Bosch mechanical fuel injection "can push bananas", not lubricated by fuel as many others are).

I will never see high mileage (31 mpg x 75 gallons/year x 30 years = 70,000 miles more) but I like solid cars :-)

And the energy to build it lies 24 years in the past.  I will let the future owner wear it out with biodiesel.

i've been checking local classifieds for quite a while looking for circa 1980 mercedes diesels with approx 150,000 miles on them. they are few and far between - as one would expect. they are also pretty expensive. unfortunately, too many people already know the value in these automobiles. but maybe i'll get lucky one of these days