Normal Oil Pressure Readings? - Chevy and GMC Duramax Diesel Forum
07.5-10 LMM Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 21 (permalink) Old 01-23-2012, 03:36 PM Thread Starter
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Normal Oil Pressure Readings?

I recently bought an 08 Duramax with 32,000 miles on it and the oil pressure guage seems to fluxuate more than any other vehicle that I've ever owned. at cold start, the pressure registers at 60 and once warmed up, it will dip down to around 28 at an idle. Is that normal? What should the pressures read at various temperatures and RPM's? I got rid of an 06 Cummisn that never showed that fluxuation. Please Help.
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post #2 of 21 (permalink) Old 01-23-2012, 03:50 PM
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yep they all do it just let er bump

2007 LBZ CC/SB SLT 4x4, 5" Magnaflow SS, S&B CIA, Firestone Airbags, Dominator III steps, De-Badged, 5% on windows with 40% on windshield, 5K HID's w/ All-On-Mod, Edge CTS Insight, SDP EGR delete w/ boost probe, Batmowheel, ATP tunes, PCV reroute w/ plug, Kryptonite Tierods & Centerlink, Cognito UCA's, Bilstien 5100's, Airdog II 165, ATP Intercooler pipe, Pump rub upgrade and Transfer case brace, Trans repair lines, LML manifold, SS brake lines, Sulastic springs, ATS pans, ATI dampner, drilled and slotted rotors with ceramic pads, 295/70-17 Trail Grapplers on H2's

Thanks Dustin and Rob at ATP and Steve and Zack at Glissions Diesel Performance
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post #3 of 21 (permalink) Old 01-23-2012, 04:22 PM
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On a cold morning mine will be just over half way. Then once warm it stays just under 1/4 I think. In running petro Canada 5w40. Its all good buddy

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2009 GMC 2500HD LMM
-EFI Live DSP5
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post #4 of 21 (permalink) Old 01-23-2012, 04:42 PM
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GM spec is 16psi at hot idle and 42psi at 1800rpm.
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post #5 of 21 (permalink) Old 01-23-2012, 04:54 PM
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It's borderline ridiculous how much the oil pressure fluctuates.

I have seen as high as 98 psi at idle on a cold idle and as low as 23 psi on a hot one.

2007.5 2500HD CC/SB LTZ
498 rwhp, 845 rwtq
DiamondEye 4", EFI Live by BobO, Edge Insight CTS, S&B Intake, Bilstein 5100 shocks, MOOG idler/pitman with SS support, Raptor 150, P553207, !PCV, !EGR, Transgo Jr, Rare Parts tie rods, 55 watt 4.5k HID low/hi/fogs, Belltech 3" lowering shackle
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post #6 of 21 (permalink) Old 01-23-2012, 05:50 PM Thread Starter
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Shewww, thank you all for your input. i was freaking out a little.

How about being kind of loud and rattely when cold? Sometimes my dash squeeks and rattles a little until it gets warnmed up?
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post #7 of 21 (permalink) Old 01-23-2012, 07:37 PM
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Mine's just over 60 when cruising at 70 mph. It's as high as 80 when the truck is cold.

- Sam

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2013 Jeep Wrangler Sport Unlimited

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post #8 of 21 (permalink) Old 01-24-2012, 07:53 AM
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Originally Posted by danhr View Post
It's borderline ridiculous how much the oil pressure fluctuates.

I have seen as high as 98 psi at idle on a cold idle and as low as 23 psi on a hot one.
Exactly.Same here.

2008 LMM Silverado 2500 LTZ ECSB 4X4.
Aftermarket DSP5 calibration by Danville Performance, Blocked and re-routed, Nicktane with Baldwin BF7587, PPE lift pump with Baldwin BF1212 water separator, 285/75/17 Dura Grapplers on H2s, CTS Insight with pyro.HIDs in fogs and high beams.

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post #9 of 21 (permalink) Old 01-24-2012, 08:08 AM
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Its perfectly normal. Most manufacturers make it so the gauge doesn't move to inspire confidence. The oil pressure gauge on the lmm is actually dead on accurate. The Dodge gauge is more like an idiot light. Itll be in the middle until you have no oil pressure then it'll drop to zero.

Think about it, its a pump that changes rpm with the engine, of course pressure will fluctuate. It does with all engines. Its just a matter of how accurate the stock gauge is.

Now the lmm temperature gauge... that's a different story. 210 on the gauge = 185* in reality.

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1995 Chevy 2500 - 12v/NV4500 Swap
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post #10 of 21 (permalink) Old 01-24-2012, 08:23 AM
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Lmm oil pressure and trans temp are dead on, the fuel gauge reads empty with 7gals left, and the eng temp gauge reads 210 when it's really 185.
Gm got half of them all they need is a boost and egt gauge from the factory.

Mack: 2004 lb7
1960 f100 Cummapart conversion

Ex's:2006 LBZ ppe tuned
2007.5 LMM s366. 12.4@109
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