Just so you're aware, the '11 528's had the I6 non-turbo, NA engines similar to the E60's. '12- current 528i's have the N20 4 cylinder T engines. My wife has a '12 528i and it has plenty of power, is very low maintenance and the fuel economy is unbelievable for a car that size. Can't comment on reliability of the I6 NA engines.
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