I have a 745i, its fearly reliable besides routine maintenance. A frequent problem with the E65/66 is the audio system. The L7 amp and the ASK in the front will normally stop working after a while. Youll notice your speaker will start making a crackling noise and then they all will eventually go out, front and back. Other than that my car has idling problem where when I stop it seems to remain in high gear at times. Ive heard many experience these problems but as far as major maintenance on the engine, not really (knocking on wood) . When i bought the car it had around 60K on it , it now has 120K.
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