Thinking again about all this I now believe that I spent my money well to have 5 years of warranty
@OP
Did you drive your car in colder regions sometimes around 0°F?
BMW had problems a few years ago with a few engines when some Oil lines froze, so with a cold engine there was no lubrication until those lines were defrosted. This was leading to a lot of complete engine failures, I remember the N46 was affected. (Currently VAG has a similar issue with some of their smaller engines).
This usually happened in City only conditions, where the engine never reached proper temperatures but was shut off again, so all condensate froze again.
Seeing your mileage and the time since you drive the vehicle I doubt it was the case for you though...