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Porsche has pressure reliefs built into all their oiling systems. At track events you always do a warm up lap to thin the oil out. 2.5 bar at idle is normal when warmed up, 5 bar at 2500 rpms after warm up, right guys? Smokey Yunick said you need 10 psi for every 1,000 rpm, so Porsche thinks more is better, and they're pretty much correct.
I remember reading in the 60's that Ferrari racing teams had to "tickle" their engines to life and couldn't rev them much when cold or they'd pop an oil cooler. Hadn't invented the bypass thermo valve yet.
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