Low annual mileage, short trips, infrequent use, are not the best operating conditions for a diesel. Nor for a gasoline BMW, but a gasoline model may be more tolerant.

I prefer the driving experience of the gasoline model myself. I tried to justify the diesel on cost, but couldn't due to local diesel fuel price per litre. More depreciation with the diesel model where I live. Seems like that may be true in parts of the US as well, if they are selling at similar prices used after the diesel option cost more originally.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue