I’ve 3 diesel cars at the moment, the tailpipe on the A8 with its Euro4 system is so clean that I’ve never seen any soot on it in the time I’ve owned the car. The Mercedes has no DPF and the tailpipe has a light coating of diesel soot on the inside but nothing excessive. The Volvo is also Euro4 is very clean as per the A8. However the Subaru (now gone thankfully) also a Euro 4 had more soot on the tailpipe then a chimney sweep had on his brush. I wonder just how successful some of these filters actually are at cleaning things up
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Nite Blue 3.0L SE Quattro
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