Quote:
Originally Posted by mart_dev
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??
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When my dad's 325d wasn't doing the DPF regeneration (long story, but was the result of a bad thermostat...) he tried some of these things. He tried both the one that goes in the tank as well as the actual wash that is pushed through the DPF via the backpressure sensor hose.
While doing it, he monitored backpressure using BMWhat. He was getting right around 80mbar of backpressure at idle (normal is right 3, peaking at most to 10 right before a regen is carried out; this is from my X5)
The results for him were:
1) The one in the tank perhaps reduced it by 10 mbar at most the first time, but nothing more
2) The wash reduced it by 40mbar the first time but nothing more thereafter.
Once we got the regen to restart it went from 60mbar to 5mbar in one run. It now ranges from 15 max dropping back to 5 after regen.
MY bottomline (just mine, others draw their own...):
1) The in tank stuff is baloney, just like any other in tank additive
2) The wash does something, just not enough
and the most important
3) The regen works the best and it's enough to keep the DPF clean
4) If the DPF clogs up something else is wrong; the DPF is not the problem.