Audi A6 Bio deisel

[suitman]

Hi there, I have a Sept 2003 A6 1.9 tdi(PD engine) and have been told by Audi I cant use Bio deisel in it. Does anyone know why?...

Cheers

[mluton]

All I know and is Audi have told you, that PD engines dont like it.

[snapdragon]

Do you have the handbook? it covers the issue with respect to your particular car...
But in general....

"All Audi TDIs produced between 1996 and 2002
can also be filled with biodiesel in accordance
with the EN 14214 standard, which became legally
binding in October 2003. This meant that Audi and
the other brands from the VW group were the only
major manufacturers of diesel cars enabling their
customers to take advantage of this ecologically
interesting option at no extra charge.
For technical reasons, however, Audi must
refrain from giving biodiesel a company endorsement
when it launches new products on the
market. Firstly, compliance with the tightened
exhaust emission regulations in accordance with
Euro IV cannot be universally guaranteed due to
the range of variation in biodiesel quality.
Secondly, trouble-free operation using biodiesel in
its pure form in conjunction with modern
particulate filter systems is technically unfeasible
at the current developmental stage.
As regards the TDI models currently in
circulation (as at February 2005), therefore, EN
14214 standard biodiesel is only generally
endorsed for the Audi A2, Audi allroad quattro and
Audi A4 Cabriolet.
It is for the reasons described above that Audi
supports the EU objective of propagating the
concept of admixtures of high-quality biodiesel to
conventional fuels and thereby bringing about a
reduction in CO2 emissions for all diesel vehicles.
Furthermore, the EU’s stipulation of binding
targets regarding the proportion of overall
consumption of biogenic fuels in Europe has
secured the demand for biofuel manufacturers’
products."

http://www.audi.co.uk/etc/medialib/cms4imp/audi2/company/environmental_protection.Par.0033.File.pdf