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Mini Cooper 2009: Diesel blows black smoke

About a month after the 30,000 km service on my 2009 diesel Mini Cooper D it started to blow black smoke out of the exhaust. The dealer advised me to run the car hard at high revs, which would fix the problem. Being a diesel, I had always thought the revs should be kept low, and the power achieved through the torque of the diesel rather than high revs, and so I am not happy about the prospect of having to "flog" the car. Is this a genuine fix, or should the dealership be undertaking repairs to fix the problem?

I would take it back to the dealer and demand it be fixed, there is something wrong with it and the idea that it would be fixed by revving the living daylights out of it is dumb.

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