A friend is making biodiesel, being generous with the lye, but not titrating at all. The first batch sure looked good, with excellent seperation. However, the 3/27 test revealed some unreacted FFA's. Now, since he is running a 1960's model diesel tractor, and an 82 MB. He's feeling like the Homebrew is close enough for his purposes, and of course, he's probably right. I don't think either of those engines will have any problem running on the stuff. I've been helping him out with this project and am pretty heavily invested in the equipment and supplies, however, I'm driving a 2000 VW TDI. What's the worst case scenario if I run this stuff in my engine? If all we are talking is a clogged filter that will need changed, I'm fine with that, but if unreacted FFA's could compromise other more expensive parts of my car, then I'm going to hold off until we get a good handle on titrating the oil. What do you all think?