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Looking for some opinions on L83 oil pressure

Jay Ratliff
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Jay Ratliff Enthusiast

Jay Ratliff

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Posted (edited)

Had my truck since new, currently at 260k miles. I've been religious about oil changes throughout its life, feeding it Valvoline 0w20 every 5k miles. I do add between a 1/2 and 1qt at about 2500 miles between changes. 

 

Lately the oil pressure is running a bit lower than usual at operating temperature. Cruising on the hwy it's running about 34-37psi per the gauge, and idling about 16-20psi. It used to run north of 40psi cruising and north of 20psi idling. Not getting any noises, ticks, or knocks, she still runs fine. I'm sure what I'm seeing is a result of the mileage, just wondering if anyone has taken one this far and what their experiences were along the way?

 

I know the old 10psi per 1,000rpm rule, and it's certainly maintaining that. Just wondering if what I'm seeing is a sign of something eminent on the horizon?

 

Also, I've considered running 0w30 or 5w30 in it, as I imagine the bearing clearances could handle it. But don't want it to cause any lifter issues since I've managed to get these this far along without problems.  Opinions?

 

Thanks,

Jay

Edited by Jay Ratliff
CamGTP Senior Enthusiast

CamGTP

Posted
Posted

Mine idles at 20-25psi and cruises down the highway at 36-38psi and I only have 123,000 miles. So I wouldn't really worry about it. Mines never run above 40psi at highway speeds in the last 6 years of ownership. Only gets above 40 when accelerating, full throttle and cold starts.

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  • 4 weeks later...
Cole Shannon Enthusiast

Cole Shannon

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Posted

Right now my 2018 truck with 140,000 miles is hot idling at 10psi on the dash. When driving or accelerating I'm at 40psi. I too have been very religous about doing oil changes evey 5k miles and use the dexos 0w-20 oil. 

 

I have replaced the oil pressure sending unit and filter screen and still get that same reading. Never have gotten a check engine light, and never hear any unusal noise form the motor, but I still just don't have a good feeling about it. I'm in the same boat looking for opinions about this, is it a real problem? If so, oil pump? Or maybe a problem with the pickup tube? 

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