Looking back at this post, I wonder how many of the comments stays true.
Having had 520, 523i and A6 2.0T & A6 2.8V6
Here's what I can say:
Engine refinement:
Both E60 2.0 and 2.5 units are smooth sweet revving and refined even at older age. Testament of BMW engine finesse.
Audi's engine unit...
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