RB25 Oil Pressure goes REALLY low on Idle

[Guilt-Toy]

Can anyone help ???

I got a r33 gtst and the oil pressure never goes under the second line (before the 4) but my friends RB25DE r33 goes all the way down to close to 0 when its idle.

The car makes a weird sound when its at idle (she calls it the gremlens) but its like a howling sound. Could that mean the oil pump is stuffed?

as soon as you raise the revs by at least 300rpm the sound goes away and oil pressure goes back to normal levels. (just before the 4 or abouts)

When driving its fine......

Whats up with the beast ? does it really matter to have close to 0 oil pressure on idle ?? The engine is NON turbo...

[2fardown]

When I put 5w-50 fully synthetic oil in my car I had the same problem. I then put some 10w-50 in and the problem went away. My conclusion was that the oil was way to thin for the engine.

This may have something to do with the problem your friend is experiencing.

[Guilt-Toy]

I was thinking that.... Did yours make a howling sound on idle too?

[2fardown]

No howling sound. But I didn't like the idea of getting near 0 oil pressure.

[Demon Dave]

Check the oil pressure guage - I had a similar problem (near zero pressure at idle) and it turned out to be a faulty guage - I was told by my mechanic that it is a common problem on skylines....

[BOOSTD]

7.5w-40 is what the factory recommend.

[JimX]

I thought it was 7.5W-30 factory recommended. I'm using 5W-30 and don't have any oil pressure problems. I actually slightly over-filled it and I was waiting for some of it to burn off but it's not happening.

[puckish]

Check the oiul pressure gauge they are notorious for failing.

Check your pressure first with an aftermarket gauge.

[Guest RedLineGTR]

As far as i know on a proper idle from factory specs when the car is at optimal operating temps it meant to sit on number 1, 1.5...

I been using 5-40w oils the pressure is exactly the same as in facotry specs, i tried a more expensive oil 10w-60w abit high but oh well though i tried it, the oil pressure was sitting at like 3-4 nearly double, it was too thick, very high tech engines and the oil aslo dosent get around everywhere it supposed to be. Probably wouldnt go over 10-50w maybe 10-40w would be perfect.

[Guest RedLineGTR]

The stock sensors may be faulty sometimes but i rekon most of the time mine reads correctly *shurgs*

[Ronin 09]

the stock gauges / senders read low, regardless of what oil you use (i have tried many viscosities) when warm. I have an aftermarket Trust oil press gauge and when i'm revving it the stock gauge reads just over 4, but the trust one is at about 6-7. Don't worry too much, @ idle the stock reads about 1, the Trust one at 1.5.