Chances are your engine will not know any difference as long as it's a 502 approved oil. Certainly as consumers we have no means to know if one oil lubricates better than another by some minute amount.
My tuner (Ed @ EQT) recommended I use Motul Sport 5w40. He beats the hell out of his car, so if it's good enough for him it's good enough for me
For the record, I was using M1 Euro spec (VW Approved) oil, and we both feel it's not up to the task for an upgraded turbo. I haven't sent it off for free analysis, I'll probably do that shortly when I change to Motul.