Hi new to the audi. Just bought a audi a4 2.5 v6 tdi quattro and I love it. Power the comfort everything. As I'm driving getting up past the 3000 rev make and higher when I change gear or slow down it kind of whisles is this normal? Some one said it should do it and could be lack of oil getting to turbo. Sorry if I sound stupid but thought I'd look on here and get advice from you guys.