A regen can’t get all the ash out of the DPFs once they’ve aged significantly - it burns off a lot but over time the nooks and crannies fill with ash. Best bet is to take them off and have them chemically cleaned. This removes the ash and restores them to good as new
DPF removal ought, by now, to be considered socially unacceptable, given what we know about the effects of PM10 and PM2.5 on long term health and air quality
Although MOT can be ‘dodged’ still, to a degree, there are still technical moves planned for MOT that will detect smoke opacity levels that exceed whatever is quoted on the VIN plate (number inside a square box, or default values). That may be a factor while the car is still on the road
Given DPFs don’t restrict engine performance to any great degree, chemical cleaning is the cheapest option without leaving a trail of smelly diesel fumes behind you
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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