While we don't specifically log oil pressure, we haven't seen any signs of oil starvation. The stickiest tire we've run is a Maxxis RC1 235, and I've also spent time in aero equipped 245 RS3 cars.
I don't believe I saw any issues with I drove Robispec's car on Hoosiers either... but it was a very brief (and conservative driving) session.
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Element Tuning Phil would be the most knowledgeable person to go to for this.