VOLVO’S all-new four-cylinder D4 turbo-diesel is a dramatically improved engine for the Swedish car-maker, bringing impressive levels of performance, efficiency and refinement to the V40 range.

The new heart does much to lift the appeal of the five-door hatchback, but is it enough to overcome other shortfalls?

And importantly, how does it stack up against key rivals from Germans Mercedes-Benz, Audi and BMW?

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