Two observations:

1. I think it is well documented that the worldwide capacity to produce vegetable oils will be quickly outstripped if diesel owners were to move en masse to using it as fuel. The result would be a huge bump in VO prices that would have a serious impact on the poor in Third World nations, for whom it's a life staple. (There is a similar problem with huge-scale biodiesel production.)

2. The economic arguments to using VO in an unmodified car have to be calculated against the possibility/probability of eventual problems with the IP and injecors -- not to mention long-term polymerization of the rings, resulting in loss of compression.

There are members on this list running unmodified cars on VO but from what they write I understand they've done the calculation and figure it works out for their particular cars. Given what I know of the Doktor's car, I cannot imagine he would want to do the same.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22