So why would ford put 50w oil in their track pack cars? I mean according to your logic the oil would shear the same and have the same oil pressure.
Why do all racing oils have high temp shear tolerance? Why do they have high ZDDP content? I mean if it was all fluff. Everyone would be running 0w20 oil.
Look at Porsche recommended oils and Nissan GTR.
0w40 or 5w50.
For normal street driving on non modified engines I am sure 0w20 is more than sufficient, but for track application or supercharged engines extra protection is warranted.
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