Why does the BMW X5 engine make a strange noise?

I recently purchased a new BMW X5 and noticed that the engine sometimes makes a strange noise. It doesn't happen all the time, but it's definitely noticeable when it does. Should I be concerned?

It's normal for a new car to make unusual noises during the break-in period. This is due to the parts settling into place and getting used to being in motion. As long as the noise goes away after a few hundred miles, there's nothing to worry about.

There could be an issue with the timing chain tensioner or the valve train. It's best to have it checked by a mechanic to rule out any potential problems.