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Had a strange whistling noise on start up today. It went away fairly quickly but sounded like the noise in this vid..

https://youtu.be/0XofkPtIRwg

Anyone else had this? No warning lights.

Any ideas on the part & number of the offending part & how easy it is to replace?

HS oil separator membrane.... Easy replace.

I pulled the rear RS carbon cover off. It looked quite different to the video I posted under there. I didn't look too closely as I didn't have time or my phone to hand. I'm guessing the video shows a 4.2L not from a B7?