I found this on the 996 forum.
Quote:
Originally Posted by Porschetech3
Oil Pressure reading at the head on my 1999 C2 with 130K miles and 5w-50 weight oil.
Cold start = 92psi
Warm idle = 20psi a/c on ---18psi a/c off
Warm engine at 4k rpm = 68psi
These pressures should be typical.
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My figures don't look bad, given that I am running 5w-40 weight oil.