I've been using this Mobil with great succses in my car.Oil consumption went from almost a 0.7l to 0.3l per 1k km.Before that i was running some HDEO 5w30 but this engines run hot and it did leave some hard varnish arond cam area.Both oils are recommended A3/B4 5w40 but shell is 229.5 and FIAT Z2 spec. and Mobile is only 229.3.The question is does shell have claimed detergents and would fight deposits better than Mobile?Car in question is Fiat 16v essentially the same engine as 500 but no multiair. Thank you Guys in advance.