The vibration, or lack of...
I 'back to back' tested the 350d and 535i and even the 530d has 'vibration', compared to the silky smooth and vibration free petrol unit. Sorry but the 520d is not in the same league as the 6-pots. Latest 2.0d engine is good, but still a compromise for refinement.
Depends what we call 'refinement' and how we sense vibration I suppose.
HighlandPete
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