320d is also a great engine but performance-wise can't compare it to 328i. Had a chance to test it also, and was just missing more power. I guess you can compare it to 320i. Diesel vs petrol is a neverending debate and people have different preferences. I owned both and prefer the petrol engine, just don't like that 'tractor' feel.
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X6 M50d Tanzanite Blue
F36 440i GC/retired; F30 328i/retired; E92 335i/retired
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