My R33 GTS-t tends to hang around the 4 to 8 figure in oil pressure, never reachs 8 usually hanging around 5mm away from the 8 line..Is this bad ?

It drops down to 4 after a while and can creep up to the same mark (just under 8) after a hit to 6, 67rpm...

Is this a bad sign...I thought they are suppose to be a little lower ?

My GTS-t is running Mobil 1 and I hit 8 at start up, when warmed up 4-6 depending on revs and 2 at idle, the previous oil (unknown) was 1-1.5 higher, so i suspect that oil pressure is very viscosity sensitive.

I am happier with the lower pressure as it indicates that oil is flowing through the engine and turbo without excessive restriction and it can do the cooling/lubricating its meant to be doing.

The oil pressure sounds OK but change oils and you may see a change down in pressure.

I get the same...almost eight when the oil is cold....then 4-6 after warmed up for normal driving....but the pressure goes way up when you rev the engine.

I just put in a brand new NISMO oil pump and checked all lines, filter, and cooler to make sure there weren't any clogs.

The real bitch for me is that I changed my tranny fluid to a higher grade...and on cold mornings, the shit is so think before it warms up, it's an absolute SHIT to put in gear!

Weird shit ...
I just put Mobil # 1 in my GTS T and now the pressure sits around 3 1/2 at cruise speed (say 3000 ) It used to be around 4 all the time with previous oil (unknown , first oil change for me)
The other thing I have noticed is how inconsistant the pressure is ??
Sometimes its 2 ....while cruising .....then you look again and its 3 1/2 ...
??
No idea why tho ...
Its annoying ..

Nissan is know to have Oil sender issues in 300ZX's. So I am not suprised that it happens in skylines too...

But Mobil 1 is know to have lower oil pressure than most other Top of the line oils. Hence quite a few ppl I know stays away from them.

Zapf

I have just purchased a R33 GTS-T Coupe automatic. It is a fresh used Jap import and the first thing I did was change the oil and filter as the oil pressure was not very good (around 2 - 3 at cruise). The oil looked like it had not been changed since Adam was a boy.
After the oil change I drove back home, a 400 km drive, and the pressure was fine (about 4 - 5 at cruise) however since then it has been reading about 2 - 3 on the gauge once it has warmed up and sometimes lower. I used some STP engine flush today and changed the oil and filter again (Penzoil semi synthetic) but to no avail.
I am thinking either oil pressure gauge or sender unit problems or a partially blocked oil gallery or oil pick- up in the sump.
Can anyone help?

Oil pressure is only supposed to be 2kg/cm Idling, 3kg/cm Cruising (about 2000 - 3000rpm) and 4kg/cm @ 6000rpm.

It will always be more in the morning due to the oil being cold and its rating