I think it was standard in some markets but not in Europe, the majority of our Coupes are manual as indeed is mine. I will pass the question on to my colleagues in France, see if anyone has any experience of this.
Black (Sport) Noir Granit 2.2L 160 hp - jusqu’au 29/04/2014
308 T9 Active e-THP 130 (demi V6) Gris Moka - volant toujours du bon côté
As you saw, apart from Amadeous's suggestion about changing the oil (which you have done) nothing else has come up. I did see on another topic that "auto-adaptive re-mapping" was mentioned for a problem to do with V6 engines misfiring and causing something similar to what you are seeing. If your transmission is also "auto adaptive", maybe some form electronic checking/re-mapping could help. (I am only guessing here).
Anyway, good luck and if I see anything else I will let you know.
Black (Sport) Noir Granit 2.2L 160 hp - jusqu’au 29/04/2014
308 T9 Active e-THP 130 (demi V6) Gris Moka - volant toujours du bon côté