I doubt that it will be on the cards as part of the service - BMW would probably have it listed as lasting a lifetime...well, what they consider a lifetime.
There are reports of wear on the timing chain for that engine, but it was sometime in 2011 (I think) that the designed was improved slightly to improve reliability. Not sure if there were recalls for older models.
It's 50/50 whether BMW will know what you are talking about, but worth asking. Cost wise it'll probably be pretty pricey, but the alternative is a new motor. That being said, I have only seen a handful of failure reports on it from overseas - nothing this side.
Hopefully someone else has more insight for you :thumbs: