My Alfa 159 is a 2006 2.4 jtdm manual with 215.000 km.
A few weeks ago a weird whining noise started to come up. I figured it had to do with the gearbox since the whining was not there with the gear in neutral. It sounded like a cogwheel spinning. Not sure if it actually is the gearbox though.
However, that noise seems to be replaced with a howl now. Under the bonnet I noticed there is quite some oil/fluid spattering around the alternator. Oil is spattered all over that area: on the air manifold, the ventilator, the alternator, everywhere (not sure if it's noticeable in the image). The sound is virtually absent when idling, but it is very noticeable when driving.
At the same time there's a considerable loss of power, as if the turbo doesn't work. The turbo pressure gauge barely moves, when revving it doesn't go above the first mark (0.2 bar and this is when flooring it). This is not the same power loss as with EGR/DPF issues which occur below 2500 rpm. It makes no difference if the MAF is unplugged or not (I unplugged the MAF a few weeks ago since I've had issues with it after replacing the EGR).
It probably is not relevant here, but for the sake of completeness: I recently had the air-conditioning condensor and some AC tubings replaced as well as the oil cooler.
Swirlflaps are on your air inlet manifold, they are known to start leaking. Should be lots of threads in here, that might help you out. Any black smoke from exhaust?
No black smoke.
I had a short stop at the workshop to have a quick check. Power steering fluid was empty which accounted for the howling sound.
The oil spatter looks like there's a worn hose somewhere. I'll bring it in for maintenance next week, will update here for others.