It seems to me like I heard that the newer model diesels would work on biodiesel and the manufacturers would cover the warranty. But I don't remember for sure and if it was all U.S. manufacturers or just some of them. I don't know if 100% would work though because it is such a stout solvent it'd probably eat through seals rather quick. That is why the didn't recommend it for older models is because the seals aren't as tight on the fuel system or something like that. I guess I need to do some more checking. I'm kind of interested in it but it sounds like the price will probably be going up since the grain markets have been up all week, but I'm not sure what the soybean market has been up. Later.