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RB25 Oil Pressure goes REALLY low on Idle

Guilt-Toy
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Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

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 Experienced

2fardown

Posted
Posted

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.

JimX Grand Master

JimX

Posted
Posted

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.

Guest RedLineGTR

Guest RedLineGTR

Posted
Posted

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.

Ronin 09 Grand Master

Ronin 09

Posted
Posted

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. :D

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