If you dont redline or dive at high rpms and only spending most of the time driving in the city, you have to consider how the power is delivered in those two cars.
As we know the bmw 6 cyl NA engines delivers power at the high rpms so you have to push it in order to enjoy the drive.
unlikely the 520d with turbo gives you a kick at the low rpms which could be something for you in stop and go traffic in the city.
530i: NM 310 / 1.600-4.250 rpms
520d: NM 380 / 1.750–2.750 rpms
all the hp fo the 530i is kickin in at 6.100 rpms and the 520d hp's kicks in at 4.000rpms
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Black Magic Wheels
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