Does anybody know what to mix into diesel fuel that will quickly destroy an engine?? My BIL's company I work for has these thiefs neighbors. It is this old autoshop/tire place that I couldn't figure out how they stay in business since not too many people will trust them with their vehicles. Well, now I know how they compensate for the lack of business, they keep stealing diesel from our semi trucks and I am sure from many other places as well (just saw them putting red diesel into some taxi driver's car the other day). Recently we started noticing that more people including taxi drivers stop by and buy diesel from these crooks. I am willing to loose some diesel over this to put them out of "business" with little work. I need to mix something into a hundred or so gallons of diesel that will definitely and quickly destroy an engine. I know exactly how to park one of the trucks to make sure that they won't be able to resist . A few taxi drivers loosing their engines should do the trick. (By the way, the local police won't be much help - only a short term solution, and I don't want to let our employees "deal" with it since they are all pretty pi...d over this and I want to make sure they don't do something stupid in the middle of the night). Thanks for the tips JR Wanna kill these ads? We can help!