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I run 15w50 because 0w30 gave me noticeably worst pressure. I ran Mobil 1 0w30 for the High Zinc content that TSP recommended/wanted.
Even with 15w50 I start losing oil pressure above 5500 rpm. Last time I really drove the car hard, I noted 50psi @6000 rpm with rev limit/Shift point of 6800 rpm. It doesn't see that pretty much ever though as the vibration kills any enjoyment of driving the car hard/I don't want to hurt anything because of the vibration.
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