The CNN article seems to be the most widely quoted...
From:
http://edition.cnn.com/2010/BUSINESS...ration/?hpt=T2
Quote:
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The problem is that today's diesel fuel has a lot of biodiesel mixed in with it, and that doesn't evaporate like normal diesel," Froberg explained.
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Personally, I wasn't aware that 'normal' diesel was ever contaminated with bio but, if that's true, I suspect it's a problem that will only get worse as pressure from the Green lobbies grow.
It's also worth noting that it seems important to avoid biodiesels in cars with DPFs, an aspect that seems to be supported by a quick google.