A diesel is always going to be slightly noisier than a refined petrol engine. Having said that I can hardly hear my S80 D5 from inside the cab. On a motorway run I can hold a conversation without shouting above the engine noise it's that quiet. The diesel gets noisy when it's nearing a service so if you were looking at a used one that may be why. They're also noisier from cold but not to the extent of the old Merc mini cabs. With 400nm of torque the pick up is pretty good although there is a slight flat spot in 1st. The geartronic box sorts that out though.
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