I am the Business Developer for a company that sells Biodiesel. For a
Mercedes you do not need a conversion kit. You can mix bio at any ratio
with reg diesel also. I have a 1982 300sd that runs great with b100 as
well as many others. The only thing you will have to do is change your
fuel filter after a few tanks as the bio will clean all the gunk from
fuel lines and clog. It is a solvent and lubricant as well. After that
your engine will be cleaned also . So you may want to carry a few
in the glove box just in case. Sometimes rust deposits clog up even
a long period of use. In cold weather you may have a cold start as the
fuel is thicker. If you have any questions.....please ask. "
Doesn't a lot of this depend on what exactly the "biodiesel" is? One
of the main purposes of the conversion kits is to allow switching back
to regular diesel to fill the fuel lines so that the car will still
start when it's 5 - 20F in the winter. At those temps, with many
biodiesel products, without the switchover, you wouldn;t have a cold
start, you would have a no start.
Are there any industry standards for biodiesel viscosity/pourability?
Without that or knowing that you will always be able to buy from the
same supplier, in a place with reasonably cold winters, I would think
you would in fact need the conversion kit.