Recently picked up a late 2008 E70 X5 xDrive30d M Sport in black - really enjoying the car and for the most part it’s in great condition for a 4 year old car.
However after 70% of journeys I make in the car (journey time seems to be irrelevant) I get this strange noise coming from the engine area. Its starts as a whirring then a release of air or pressure and lasts about 5 - 8 secs in all, I’ve uploaded a video below. Can anyone help identify what it is?
Thanks in advance for any advice. G