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[Mike94]

Goodmorning everybody! I'm writing from Italy, my daily car Is a 2002 wagon 2.5 DTI.
About a month ago i noticed that smoothly accelerating in neutral generates a vibration from the engine, that seems to loose power at costant gas like is running on 5 cylinders , and starts to make grey smoke. Over 3000rpm i get full Power!
I have a sort of hiss from the airbox zone, thinking it's probably an intercooler hose, when i do this acceleration tests i noticed that the rough running and power loss are related to the disappearance of the hiss (so less turbo pressure?).
Driving normally i do not notice all this issues, except for a slightly "push-pull" around 2500rpm on Cruise control.
Oil consumption Is around 0.5l every 8000km, mileage about 260000kms, fuel consumption is good, 6.3l/100km in Winter.
Any ideas? Injectors?
(I had in past some diesel tank algae organisms)

[TheBoy]

That engine is quite rare in the UK (we got the 4 cylinder 2.2DTi after the original 2.5TD, instead of the common rail 2.5DTi).  Hopefully one of our European members can assist

[speedy_ns]

If injectors are bad you would experience black smoke while accelerating ( M57 runs fine even with 2 or 3 bad injectors)
There is tutorial on YT how to check them, if you don't want to take it to the specialist.
If your Omega has rough idle, you could start buy disconnecting one by one, and see if there is any difference.
My money would be on a Turbo, or something around it (check for oil in intercooler, hoses, clamps,)... White/grey smoke usually mean oil in compression chamber.
Another possibility is that high pressure fuel pump on it's way out, which I doubt. Check for diesel in oil pan.

[Mike94]

If injectors are bad you would experience black smoke while accelerating ( M57 runs fine even with 2 or 3 bad injectors)
There is tutorial on YT how to check them, if you don't want to take it to the specialist.
If your Omega has rough idle, you could start buy disconnecting one by one, and see if there is any difference.
My money would be on a Turbo, or something around it (check for oil in intercooler, hoses, clamps,)... White/grey smoke usually mean oil in compression chamber.
Another possibility is that high pressure fuel pump on it's way out, which I doubt. Check for diesel in oil pan.

No diesel in oil pan, already checked, no rough idle. When heats up runs very well, critical point is until temp gauge reaches first quarter

[dave the builder]

Have you looked at live data from engine sensors 
coolant temp sensor ,mass air flow etc