On my 2009 2.0TDCI i have had almost a whooshing noise on heavy acceleration, on inspecting the usual pipes I have discovered a small oil leak on the Intercooler pipe that goes to the turbo at the back of the engine block. Didn't manage to get a proper check done as its tight under the car and only quickly jacked it up, plan to do a proper check soon.
Definitely worth checking all the pipes for splits
Well the car went in for its service yesterday and I got them to check all around the pipes at the back of the engine, it turns out that a jubilee clip had worked its way lose therefore this was where my whooshing and oil was leaking from.
All tightened up now and all pipes are in good working order with no splits