I've used b10, b20, b30, b50,b80 all approximate percentages and with zero
problems in my 96 passat tdi. If you go to www.tdiclub.com you will find
many many tdi owners (older and new vehicles) using b100 for years with no
problems.
No one is disputing that pre-2004 TDIs run BD just fine.
The question Mel asked, as I understood it, was whether the higher
injector pressure found in the new unit injector (Pumpe Duse) engines is
incompatible with biodiesel usage.
The Bosch designed unit injectors found in the PD engines get up into
the neighborhood of 20,000 psi. Questions have been raised on whether BD
use is appropriate at such pressures. My understanding is that these
pressures are much much higher than either the old distributor pump or
common rail designs used in other models.
My original point remains unchanged; do not assume that experience with
pre2004 TDIs and BD use can be extrapolated to new PD engines. This is
not to say that they won't be fine, but the history just isn't there...yet.
jh
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