Thanks man, for all the info... I'm definitely aiming for Motul 8100 X-clean 5W-40, it's even on sale now in a local store (5l ~ 40e).
I will order it now and that filter i mentioned before...
Your engines clutter noise when cold is probably just a normal diesel noise when cold. I had 2.0 mjet Bravo years back - very similar engine, just different stroke IIRC, and now have 1.9 16v mjet and 1.9 8v mjet. Both are noisy when cold, especially the 8 valve. It is normal. PSA are more refined, VW, for example is not - speaking of contemporary engines.
With mjet 2 engines FIAT/AR modified valve train - roller type now and thus requires low HT-HS oils. That would be C2 oils. However, personally, you can't go wrong with high HT-HS C3 oils. Really any would do- FIAT spec is not required as only few had it. An C3 with BMW LL4 or MB 229.51 will do great. Dexos 2 is alternative too, that was/is what Opel used in these engines.
Motul x clean is priced well and is good oil, Mobil ESP too, but expensive here. MANN and Mahle are first class filters, avoid UFI.