There are many discussions on the "Diesel Secret" and many have discovered their seceret and I believe it is tolulene, Every discussion I have read about this indicates that this is bogus and could potentially damage your engine. What most people do not know is that you can get their MSDS from government as they have to file it to sell it. Others have researched this and their resounding response is "Snake oil". read around the biodiesel now forums and you will find it. My recommendation is don't use it unless it is proven.