What is oil pressure supposed to be?

[elgyqc]

I have searched and even though this question has been asked before I could not find an answer.
On my newly installed gauge (VDO running off a 996 sender) I get over 80psi on could start, drops to 40psi at cruising speed (2000-3000 rpm) and about 15psi at warm idle.

[gabedrummin]

The oil light comes on at 7 psi.

[elgyqc]

Originally Posted by gabedrummin

The oil light comes on at 7 psi.

Thanks, that is interesting to know.

[blue62]

Old school rule of thumb was add 10psi to idle oil pressure for every 1000 RPM.
Engine oil at operating temp.
That was on 50's-60's engines. probably still "close" today.

[elgyqc]

I found this on the 996 forum.

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.

My figures don't look bad, given that I am running 5w-40 weight oil.

[jaykay]

Great question search on here an you should find some pressure data and corresponding conditions.....hopefully it will be non accusump

[elgyqc]

Just back from a couple of hours on the road where I noted these pressures at 180 degrees F
idle 13 psi
2600 rpm - 50 psi
This on an untouched engine (as far as I know) with just under 100,000 miles on it.