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[jdkline]

The pollutant that everone is talking about is called acrolein. Don't know how big of a problem it is, but it sounds kind of nasty, although it does not persist in the environment for very long. The website OMNSCUR_Net referenced had a discussion on this not too long ago. Most concerns about durability with WVO/SVO systems has to do with injectors coking up, spray pattern becoming strange and washing down the rings and /or ring stick. Again, most people that say this have decided biodiesel is the best alternative fuel. I'm with biodiesel just because if you make a good product, you won't have any problems except maybe some initial filter plugging as it cleans out the fuel system. This would also be expected on SVO(so get ready folks, take a few extra fuel filters). To answer the gentleman from Germanuy's question, there is a concern about biodiesel or veggie in older natural rubber equipped fuel systems, but at least on my truck, al rubber parts are easy to reach an d replace if teh begin to leak. It has not been a big problem for the biodiesel crowd over here, many of whom run older Mercedes 5 cylinder IDIs or old VW IDIs.