I picked up the following excerpt from Fred's TDI forum:

#---------------------------------------
One disappointment from today: I inquired about biodiesel in this new engine, and they said anything higher than B5 causes problems for the particulate traps (????) and cannot be used. Makes no sense to me, given that biodiesel dramatically REDUCES particulate output...but he did say that VW authorizes use of B100 in Europe in TDIs up to 2004, when the particulate traps started going in and, ostensibly, problems started occurring. We'll have to learn more about this. Apparently testing is still taking place.
#--------------------------------------

The VW TDI engine in the 2008 models is a new common rails design with a lot of extras to counter diesel emissions, but I feel over time VW will work out problems it currently has with running biodiesel in the new engine. If VW doesn't come up with a solution to running biodiesel in the new engine, then the boys over on the forum will, no doubt, figure out a way to do it, but it might void the warranty.

Regards,

LelandJ

Chet Gardiner wrote:

Will it run on bio-diesel?

Leland Jackson wrote:

Sweet!

http://www.autoblog.com/2006/09/23/2008-vw-jetta-tdi-spotted-in-the-us/

Regards,

LelandJ


[excessive quoting removed by server]

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