Hi guys, i'm looking to purchase a F30 with N55 engine, would like to check to see on the maintenance cost of the car? Is it much higher compared to the 320i or 328i? Seldom see any post on this model as i believe is pretty rare in the market. 1 of the cars i've seen have this issue, would like is it expensive to repair: 1) Gasket leaking - i've notice this as a primary issue in the n55, is it expensive to repair? 2) Aircon blower weird sound at high fan speed 3) Overall general maintenance - Oil & fluid change? any estimated cost?