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Old 08-06-2011, 09:58 AM   #1
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2006 chevy 2500HD Duramax oil pressure.

I recently bought a 2006 chevy 2500HD with a Duramax 6.6 and failed to notice the low oil pressure at an idol. On first start the pressure is mid gauge but as the engine warms the pressure drops. The pressure comes up upon acceleration and runs mid gauge. Do I need to be concerned or is this normal? Where should the pressure be when idol?
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Old 08-06-2011, 10:14 AM   #2
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First, welcome to iRV2. We're glad you've joined us.

The first question to ask is what oil, and what viscosity, are you using? That will have a huge effect on oil pressures.


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Old 08-06-2011, 10:32 AM   #3
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Got 85,000 mi. on mine, the oil pressure has always looked too low.
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Old 08-06-2011, 06:17 PM   #4
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At 104K miles, my Duramax has 40psi at hot idle, 65 at highway speed. The pressures were about 10 psi higher until the injectors failed and filled the crankcase with fuel. I use Shell Rotella 15W40.
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Old 08-07-2011, 07:31 AM   #5
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I wouldn't be concerned in the least, I have 227000 miles on mine it is exactly as you described. I run Rotella 30wt, have since it was new, I might go to a 40wt soon, it's almost broke in now.
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Old 08-07-2011, 07:47 AM   #6
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If you're worried about the pressure, have the old oil analyzed at your next change and put your mind at ease.
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Old 08-07-2011, 03:25 PM   #7
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Quote:
Originally Posted by RustyJC
First, welcome to iRV2. We're glad you've joined us.

The first question to ask is what oil, and what viscosity, are you using? That will have a huge effect on oil pressures.

Rusty
I can't be sure since I just purchased it. I had planned to use what the manuel says. 15/40? Usually Rotella. Since they just changed the oil I hate to waste it by changing it again. I have been an auto mechanic for 18 years with limited diesel experience so I believe in what the factory recommends is the best for longevity. Any advice would be great!
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Old 08-07-2011, 03:27 PM   #8
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I wouldn't be concerned in the least, I have 227000 miles on mine it is exactly as you described. I run Rotella 30wt, have since it was new, I might go to a 40wt soon, it's almost broke in now.
Straight 30 or 15w 30?
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Old 08-07-2011, 03:29 PM   #9
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If you're worried about the pressure, have the old oil analyzed at your next change and put your mind at ease.
Great idea who should I use?
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Old 08-08-2011, 06:46 PM   #10
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Great idea who should I use?
Googled oil test kits and found this one: Oil Analizers Used Oil Analysis Kits - GM Duramax - Filters & Maintenance - Oil Analizers Inc. Oil Analysis Kit
Looks like it's a better trend analysis tool, but you have to start somewhere.
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Old 08-08-2011, 07:13 PM   #11
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Straight 30 or 15w 30?
I have been using 15w 30, and since my last post I changed it to 15w 40, very little if any change in oil pressure.
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Old 08-08-2011, 07:48 PM   #12
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Had an 05 Duramax, idled at approx 30 pounds when hot. Everything I read said that was about normal, my 2011 idles at 40 to 45 pounds when hot.
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Old 08-09-2011, 08:15 PM   #13
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Old 08-19-2011, 01:16 PM   #14
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I had a 03 Duramax using Shell Rotella 15-40 W and it ran higher oil pressure than my 06 Duramax. The LBZ had a higher volume oil pump than the 03 has. Running down the road hot it a little over 40 psi and been like this since new. I would not worry about it. I saw the 03 go past 90 psi when cold and ran just under 60 psi when normal temp. I now got 77,000 on the 06 LBZ.
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