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Is that what I think it is? a water cooled turbo[:-]
Mayfair when soot is burned it turns to ash just like your charcoal in your barbeque does. Ash builds up in the dpf and eventually the dpf will need pulled off and cleaned
for further clairification on the the rgen mode. the computer actually injects fuel in the exhaust stroke. the fuel then actually burns in the exhaust and literaly burns the soot into co2 and very little ash. the scheduled maintenance for the dpf is 100-120k ingenious idea crappy for exhaust flow