Hi. I raised this topic last year when my dad bought me a few bottles to try out. Granted my DPF wasn't clogged at the time, nor has it been since, but I did notice that after travelling some distance on the tank of fuel containing the additive there was noticeable soot coming out the exhaust under acceleration. This stopped happening once I stopped using the additive which left me wondering if the "soot" I noticed was in fact being burnt up as a result of the chemical in that additive reducing the flash point of the soot in the DPF or...was it just the stuff in that bottle burning up which caused the smoke? I guess the only way to know for sure is for someone with a confirmed clogged DPF to try it out??