v6 high diesel mpg

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    V6 Diesel S320 CDi rough running

    Just bought a 2006 S320L CDi with 155000 on the clock. Engine seems to run a bit fast on idle and the it sounds a bit rough, not like the same engine in the CLS with similar mileage I have. MPG is as low as 19MPG up to 27MPG:(. Before I start prodding and undoing things, is there anything...

Mercedes-Benz Servicing, repairs, engine and diagnostics
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