Normal Oil Pressure Readings? - Chevy and GMC Duramax Diesel Forum
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Old 01-23-2012, 03:36 PM   eBay Motors  #1 (permalink)
 
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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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Old 01-23-2012, 03:50 PM   eBay Motors  #2 (permalink)
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yep they all do it just let er bump
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Old 01-23-2012, 04:22 PM   eBay Motors  #3 (permalink)
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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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Old 01-23-2012, 04:42 PM   eBay Motors  #4 (permalink)
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GM spec is 16psi at hot idle and 42psi at 1800rpm.
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Old 01-23-2012, 04:54 PM   eBay Motors  #5 (permalink)
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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.
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Old 01-23-2012, 05:50 PM   eBay Motors  #6 (permalink)
 
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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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Old 01-23-2012, 07:37 PM   eBay Motors  #7 (permalink)
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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.
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Old 01-24-2012, 07:53 AM   eBay Motors  #8 (permalink)
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Quote:
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.
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Old 01-24-2012, 08:08 AM   eBay Motors  #9 (permalink)
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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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Old 01-24-2012, 08:23 AM   eBay Motors  #10 (permalink)
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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 right..now all they need is a boost and egt gauge from the factory.
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