Sorry about the slow reply.

Benz call bio diesel 3 things
1) FAME: fatty acid methyl ester
2) PME Veg oil fatty acid methyl ester
3) rape seed oil fatty acid methyl ester

Bio diesel with increase fuel consumption slightly, reduce rated engine output, exhaust emmisions are similar but black smoke is reduced.

Approval: as of 8/99 for individual models, E200/220D or CDI and C200/220 D or CDI bio diesel vehicle equipment is available as special equipment (Code 921). Parts required ar in MB document SI00.40-P-0005A and SI00.40-P-0010A (neither of which I have access to on my work system since this feture isn't available in Aust).

In another document I found refers to the changed service intervals for bio diesel.

Engine oil: Same interval
Diesel Filter: every 30,000km/18,000mi. diesel filter must be changed shortly after converting to bio diesel if diesel has already been used for extended periods (10,000km/6,000mi)



You need to find a dealer who can lookup the 2 documents that I can't access because they list which engines can handle bio diesel (the seals in the fuel system are the problem).


You'll have to judge if the fuel cost savings justify the extra expense of more regular filter changes and the risk of damaging the expensive CDI components.


I hope this has been of some use to you.

__________________
Alex.

MB Tech
Sydney, Australia
Volvo 122S
W201 190D 2.5 manual
W202 C240
W203 C32