Thanks already guys.
I did read through hertfordnc's decision process on the '95
Also an w210 discussion on the alternative fuels section (a little homework)

I would be doing a quality 2-tank system before using any veggie oil, and know this will sacrifice some trunk space.
Room increase from w123 platform doesn't have to be huge, but 190Ds sound too small.

I am going to look at a 1986 300SDL this week. Would that long body weight just guzzle the fuel climbing mountains?
My non-turbo 300 climbs slow and isn't anything awesome on mpg.

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1990 300D 2.5Turbo, two tank WVO, daily driver 300,911
1992 E300 gaser, 150k. Parts only, For Sale

[B]1984 300TD Euro 4speed Sold
1977 300D Elsbett SVO single tank Sold
1981 300TD "Silver bullet" 285k ran B100 Sold
1981-5 300D x 5 cars stripped and reused, parts for sale

Other toys:
1995 Dodge 2500 Cummins 12V P7100 Bosch mechanical pump with 2 tank veggieconversion kit, only 120k!
1959 Cadillac Dad's legacy, needs finishing