I've just had the same conversation with our Master Tech this morning.
The Multi air Evo MUST ONLY have the specific 5w40 Selina oil designed for that engine.
10w50 is too thick for hydraulic valves.

Their computer system "E-Sigi" will tell them that a multi air engine must have 5w40

I dont know.

I called them up again and they told me about checking with Petronas and Petronas have said it's 10/50, the thing is they told me this on my 9k oil change after I convinced them the car needed an oil change at 9k, as they told me it didn't  this was when my car was stock and without any doubt required the 5w/40 stated in the manual, can't trust them.

That when I brought the car to Vospers for the 9k service and subsequent Esseesse kit fit as at least you guys have some knowledge on the car but popping to Plymouth to get a job done right is hardly convenient, then again niether is this, it shouldn't be this hard to service a vehicle.

JamesSS, I was thinking along your lines, but like you don't know the impact, I use stop start a lot, so the correct oil grade is probably quite important, strangely since the service the car has not started correctly twice from a stop start scenario and its always been perfect, it gets used 3-5 times a day, so I know it well, which does make me wonder.....but at the same time I am also using A/C which I don't normally do and it could be the impact of the loading from that and juts a coincidence.

Cheers Jon, I'm going to pop down there now and have a face to face with them as I am not happy to be honest.

The same picture is in all the handbooks so stock image would be my guess as the handbook is quite clear on the oil to use in the maintenance section

I mentioned this when I was in there today, they checked with the brand manager Paul who also claims it is 10/50w, I have no way to prove other wise.

On the petronas site it tells you 10/50 for all Abarth cars fitted with the kit and 5/40 for cars with multair, which makes it clear as mud, what oil do you put in a multiair fitted with kit 

I personally think I have the wrong oil in my car as there is not a 10/50 on the market that conforms to ACEA C3, anything that conforms to that standard is either 0/30, 5/30 or 5/40 oils with appropriate high temperature and high shear which is higher performance oil than normal oils, this is what the ACEA C3 standard gets it.

Of course I am unlikely to find out about any damage the current oil could be doing until way down the line, most likely when I am out of warranty