Multiair egineers around the world agree that the MA unit needs as thinner oil as possible cause it runs through the MA alla the time and has to lubricate everything perfectly, so it cannot damage it,in worst case scenario it will consume it so i will go back to 5-40.
New 0-30 lubricants such as ENEOS keep really good characteristics even in same high temps as 5-40 would do.Also, without an intercooler on summers i keep my foot up even with 5-40 (at least as long as i have stock intercooler) so no fear.
Lastly,new specs for Alfa Romeo G MY 2014 manufacturer reccomend 0-30 so we will see....