I just got an evo 8, it has 36k miles on it and drives like a champ. But at HOT idle i noticed the oil pressure gauge showing 0-5 psi of pressure. When its just warm it shows anywhere from 5-12. Cold its like 20-25. I have done a lot of googling before i posted and noticed some similar problems but most of theres dont give answers. I have just changed the oil with RP 10w30 and that didnt do it. Then threw on a mechanical gauge and that didnt change. Any other ideas or should i plan on pulling the engine?

 

Where are you measuring the oil pressure?

 

at the second plug on the OFH. from what ive noticed it doesnt burn oil and the oil looked good when i drained it from the change.

 

Five hot is okay, zero isn't.

 

Yea it fluctuates a little and normally is on the 5 side but when it drops it scares the hell out of me, how would you know if its the oil pump or main bearings? Any tell tale signs?

 

I suggest connecting a mechanical gage, one of known good quality. Be sure you are actually reading oil pressure that low before doing anything.

 

Doesn't the manual state it should be 3-5psi at idle? I think you're fine.

What is it at when cruising or accelerating?

 

It rides about 25-30 in 5th going 60. thats at about 2500 rpms

 

Heres a video after it running tonight, anyone care to describe the sound it makes when you rev it now?

 

rod knock

 

Yea thats what i thought, im about to be sick.

 

Yea, time for a tear down on that one.

 

Cant trust anyone, literally just bought it about 2 weeks ago, and it happened tonight after 200 miles.

 

Wow that sucks man.

 

That is a big bummer, man. Hope your luck turns around.

As a (not so great) silver lining, at least this is an opportunity to go with stronger internals if you had lofty power goals.