I have had my bmw for 6 months, it has at the moment 40 thousand miles on the clock.
It has been back for a rear diff, a clutch, handbrake alignment, propshaft allignment 3 times, some sort of modification on the propshaft, to dampen noise.
I have pushed for a replacement, the car has been back 8 times for the problems above and more that i cannot remember at this moment, but now, this is the problem, that has been ongoing since i owned the car.
There is a noise coming from the engine that is louder than other compacts, it has a quiet but noticeable rattiling coming from the left side of the engine, (the side with the oil filler cap) the service mnager says it is something to do with that.
It is made worse when driving by traffic and the noise bounces back, like a bearing sound. I dont know what it is, it is very annoying. and i think that with having only 6 months warranty left, it will prove costly soon.