2009 Peugeot 407sw Biturbo and recommended oil.

[RONDO]

Greetings from France .... ...
I have a 2009 Peugeot 407SW 2.2l biturbo estate ... it has 147K kms on the clock and runs like a rocket on the major highways in France, especially when the Gendarmes aren't paying attention!
I'm up for an oil change this week - having already done one already; had the car less than a year. I'm using the best 5w-30 low SAPS oil I can find locally, Shell Helix Ultra ECT C3 5w-30, so please let's not get into an oil discussion. The Diesel here is low sulphur and an ACEA C2/C3, MB 229.51, VW 504.00 / 507.00 standard and approvals is better than anything Peugeot can put in there ...
Somehow ... beyond me seemingly arrogant intro to the post, (please excuse me) ... I have the urge to use a ECT 5w-40 oil in this vehicle. Here's my thinking on it and by all means jump right in there with yeas or nays:
A "normal" 2.2L engine (without DPF and turbos) would be smooth as silk using a synthetic 5w40 oil.
1) So ... with a DPF system and Cat converter added; would it be ok to use a synthetic ECT 5w-40 with cert and approvals mentioned above?
2) Is a synthetic 5w40 oil too thick for the twin turbos - remembering that the turbos operate separately from each other, one kicking in at 2,500 rpm and the other kicking in at 3,000 rpm, thereby offering a smooth increase in power when needed.

My main concern is when the turbos are cold and/or hotter than Guy Fawkes's pants: do the turbos and related gear absolutely need a thinner oil. Thinner oil does have more flow, I think, but please indulge me in the 5w40 that I would assume would provide a quieter ride and better engine protection for the long run.

See; clear as mud!
Let's hear it ... there are thousands of 407 owners waiting for your replies!
RONDO

[RONDO]

Bump! Not one reply in eight months? C'mon ... You have now been officially shamed ...

[GiveMeABreak]

I think you answered your own question there.... asking for advice in one sentence and then declining any debate in another - so that's not going to encourage replies.

However, if you pop your VIN up I will certainly be able to advise on the correct oils that can be used. I need this to ascertain correct engine code and it will be automatically masked from public view on post submission.

For reference, as far as oil goes, the ACEA standards indicate minimum oil performance. The requirements imposed do not correspond to the oil performances recommended by Peugeot, Citroen or DS. These standards are only a basis for performance and therefore ACEA standards do not meet PSA requirements.