10w40 semi is std or you could upgrade to 5w40 or 0w40, all A3/B4.
So long as its A3/B4 and from a main manufacturer you won't go wrong.
0w50 and 10w60 just give the engine excess oil pressure amd resistance, whilst the engines seem to tolerate it, it isnt good for them unless you happen to be on a track day (0w50) or endurance racing in a desert (10w60) and is certainly not an upgrade. There is no need and the thinking behind it is misinformed.
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