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The solution to my VW's DPF woes was to use DPF cleaner (bought cheaply in bulk from a tractor supply) and use it every tank.
One time it took 200km of highway miles to get the DPF light to go out. With DPF cleaner, problem solved, never had a light since.
The fuel saving seems to be about the same as the cost of the additive.
Renault are claiming the DPF in my new Trafic is good for life, and they claim the engine is good for 400,000km. I'm still using the additive.
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