Hi all, this is my first post. I have 2008 facelift model BMW 520d. Replaced turbo last Jan. Similar power problems again just last week but turbo was taken out & sent back to examine it but came back as all ok & perfect. Mech told me I will have to replace crankcase Ventilation filter which he showed to me & seems to be incorporated as part of the whole cover(not a mech myself as u can c) but this is gonna cost me 500 euros for part alone. What do you think. Seemingly later models have a separate filter from the casing. Is there anatin else I should check first b4 I pay out 4 part. Cheers, m