You have to careful reading crap on the internet. Everyone has an agenda. I do not believe anything until I've seen the same information in a university study or several different sources. Higher viscosity is great fromt he standpoint of lubrication. Injection varies with viscosity so it might not be good as spray patterns deteriorate with increased viscosity. But biodiesel is required to be within the specified range for diesel fuels. Straight vegetable oils are not.

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Greg,

Agree with you there about the Internet. What I do is to make sure I read as much as I can, that's presented on any search engine. And it can be useful to use more than one search engine. The problem is retaining what you read.

Just now, I stumbled on this:

http://auto.howstuffworks.com/diesel.htm

Mesmerizing. And the article is quite informative.