Low Oil Pressure?
 

Hey guys,

I’m not entirely sure if I have a problem here but I am a little concerned...basically my engine’s oil pressure doesn’t seem to increase past 40psi after full warm up. I know the general rule of thumb is at least 10psi per 1000rpm but at 5k rpm and above, the oil pressure doesn’t go past 40psi.

I initially thought I spun another bearing but my idle oil pressure is at ~10psi with no oil light at all.

I just changed the oil to Motul 0w-30 from straight 30wt (Lucas Break-in Oil). Do you think it has to do with changing oil viscosity or do you think have another engine problem....?

Screenshots from the video I recorded are attached.

That's definitely low, but your idle pressure seems fine.
Where is your gauge getting the oil pressure? if it's not at the below location it might read different:

https://lhtnoa.bn.files.1drv.com/y4m...&cropmode=none

What temperature are you checking oil pressure at?

What mods on the car?

The gauge is reading from the port right next to the A/C compressor. Car has a JDL Turbo Kit and JR Dual Radiator/Oil Cooler. The pictures I uploaded also shows oil temp. It’s the middle bar on the gauge cluster. I think it’s around 212-225F..


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Might be worth to plug the gauge into the oem pressure switch spot and check the pressure again.

So if I change the pressure reference point and see an increase, should I still be worried?

I was under the impression that the pressure port by the A/C compressor gives more accurate readings since it’s basically the same oil journal as the main/rod journals...


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No.

Do you have a restrictor on your turbo feed?

it may be more accurate wit respect to the actual oil pressure on the journals, but we don't have Subaru supplied reference data for that port. 40psi could be normal for that port, who knows?

I'd check the pressure switch port against Subaru's literature, then start worrying if it's low. Also make sure you test standing still and in neutral, so your turbo doesn't suck down a ton of pressure cause it's under load.

Any update?? I spun a rod bearing last year. Had a block built by GCH longblock racing, installed sbd turbo kit that failed. They linked it to low oil pressure so upon installing an oil pressure gauge we have the same issue as you. Low idle pressure around 4-8psi and it won't go above 30psi at any rpm range.

Have you dropped the oil pan and checked your oil pickup? Someone putting something together also means that someone could've made a sealant mistake and now it's clogging your oil pickup

Necro. This sounds like my issue. Did you ever figure our your issue?


I have pulled my oil pan and looked at my pickup, there was some stuff but i doubt it would make this much of an issue.