Just bought the car a few weeks ago. 2018 M550i with 31,000 miles. In immaculate condition and all services are up to date. Day 1, I heard this noise. It happens occasionally, more often I hear it if it's been idling for a few minutes. I heard it first at a drive thru, and heard it again when I was snapping pics of the car and it was idling. Doesn't seem to happen when driving, and there are no codes and car runs fine, temp is normal. I made an appointment and dropped it off this morning for this and to find out why the park assist isnt working properly. Here is the noise...Ideas what it is? Sounds like it's near the turbo maybe?