Some of you may have observed from some of my posts that I am VERY interested in WVO (waste vegetable oil) systems. I'm designing one now for my truck. I also particpate on one of several WVO forums, www.greasecar.com, which of course is dedicated to the topic, including bioD as well. DSE, or "Diesel Secret" has been discussed numerous times there, with some whom praise it and many others whom refer to it as snake oil. You may wish to do a search on that forum if interested. BTW, DSE is NOT made from bioD, it is an alternative process to bioD, both of which start with VO as a stock. Some have suggested that DSE contains ingredients such as paint thinner, but nobody has been able to prove anything explicitly and no long term testing/effects have been conducted/determined. I would be very cautious about putting something as "unknown" as DSE in my engine. Personally, I'd use WVO with a WVO kit rather than bioD or DSE; I don't see the advantages over WVO.