[dort]

Hi all!

I have an e90 with n52b30 engine, pre face lift. For a few weeks now I have been hearing a strange noise coming from the engine when revs go above 2k rpm. It usually stops after a while of use, after about 20-30 minutes of driving. No fault code is thrown by the car, and the engine doesn't feel like anything is wrong. I also tried listening, but couldn't make out where the sound was coming from in the engine compartment, but I don't think it's coming from the front area. Could it be just the cold? Or does it indicate a problem?

Here is a video how it sounds:
https://www.youtube.com/shorts/CLUf-0KEHf0