I looked into this quite a bit last year. The obvious answer was that each engine/vehicle had it's own unique points to consider. My own 200 tdi would run ok on straight veggie oil, provided you heated it up before it went into the fuel injection pump.
It is too thick in it's natural state to lubricate the fuel injection pump which over time will lead to it wearing prematurely. A kit existed that would heat the oil before it went into the pump to solve this. From memory it was about £440. Or as above, perhaps wrap it around the exhaust, but you can't use this method to start or do short trips.
Many people also reported that they needed to change their fuel filters once or twice within the first 1,000km of use as the veggie oil seems to clean out the fuel lines quite well.
I've chucked in 20 litres with 40 litres of deisel and not noted any difference of any kind.
Whilst it pollutes less from memory, it's not going to save the planet unless you all want to stop eating meat and suffer from hay fever (in a nutshell from research) See this link for more:
http://www.monbiot.com/archives/2007...thal-solution/
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