I wouldn't fool w/ a WVO conversion today, since bio-diesel fuels that are fully compatible w/ existing engines are coming out. For a year we have been able to buy "Diesel HPR" in CA, at 10c/gal cheaper than regular D2.

Parts cost equates with how many you see in the junkyards. My 1985 300D parts used to be outrageous, but now I see them in the junkyards regularly, as well as a few later M-B diesels starting to show up.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans