Hi all I'm new to this and hope I'm doing it right. I have a 2013 insignia 2.0 Cdti 140 bhp, and it has started to to make a horrible noise when I start it in the mornings, or when left for a long period of time. It only lasts about 10 seconds when it does but doesn't sound good. It doesn't sound like the aux belt it's sounds more like a rattle from behind the cambelt cover but could be wrong, has any one else had any issues like this??