I read on a Auto-Manufacturer owned forum that: "anymore than B5 (5% Bio-Diesel) may cause problems, B20 (20% Bio-Diesel) is taking a huge risk and B100 (100% Bio-Diesel) is hazardous"...is that statement full of crap? I think that the Auto companies are trying to make consumers avoid it so that the company can make "flex-fuel" systems...basically the same cars only more expensive. That would be an obvious plan that could make them even more money. I have yet to experiment with Bio-Diesel but I am contemplating that maybe some risks exist?