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How do I keep the DPF clean to avoid trouble with the new MoT?

With regard to the new MoT changes for diesel cars with DPFs, how can I go about keeping my DPF clean? I have a 2017 Ford Grand C-MAX 2017, which I usually use car for city runs. It doesn't get much use on motorways.

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Only ever use Superdiesel and stick to the same brand. After starting the car stay in lower gears keeping the revs to between 1500 and 2000 for the first five to ten miles (don't bimble along at 1000rpm). Take your car for proper runs of at least 50 miles outside the city every week. Take it for a 40 mile run using plenty of revs immediately prior to the MoT.
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