Hi guys, Bought a 52 plate c5 hdi 110 estate lx with 95k. decided to have a proper look over the under bonnet area today and everything is extremely clean except for one part. I am guessing this is an air doser valve? there is oil covering it and pooling in the cavity below it. Its not flowing and looks like its accumulated over time.. The car ( to me ) seems sluggish for a 110 could this have anything to do with it? Any ideas? Rhys