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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ, LMM & LML engine specific topics.

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Old 10-31-2006, 05:34 AM
rvfool rvfool is offline
duramax since 2001
Join Date: Apr 2006
Location: Henderson NV
Posts: 3
Thumbs down LBZ oil pressure

just picked up my new 07 duramax and driving it home I noticed that the oil pressure only got to 45 to 50 lbs. my 01 when new was at 80 and at 94K it still was at 60 at 2000 rpms. I'm worried that this is a major problem and should take the truck back before they send the paper work to DMV and tell them to give me another truck.
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Old 10-31-2006, 05:57 AM
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cowboywildbill cowboywildbill is offline
Join Date: Oct 2002
Location: USA
Posts: 1,203

That pressure sounds about right for the LBZ. Mine only carries 30 at idle and 40 to 60 at cruise. Our 02 did carry 80 at high rpm and 60 cruising.
There have been some post about this LBZ lower operating pressure.
I wouldn't worry to much. Hope that helps.
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Old 10-31-2006, 07:15 AM
gfd464 gfd464 is offline
Join Date: Oct 2006
Location: Long Island, NY
Posts: 5

Same here, 40-50#
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Old 10-31-2006, 08:20 AM
Kennedy Kennedy is offline
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Join Date: Mar 2000
Location: Loyal WI US
Posts: 10,589

You should be just fine. Oil psi was either reduced OR the new databus reading (03+) became more reasonable/accurate.
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Old 10-31-2006, 12:01 PM
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Mark Rinker Mark Rinker is offline
Join Date: Jun 2003
Posts: 5,813

I had the dealer test my oil pressure on my '05 LLY. Gauge read slightly low at idle, and they have a bulletin out that states 15+ PSI at idle is acceptable. My LB7s read much higher than the LLY.

I think its all sender calibration and gauge accuracy myself.
2011 Chevrolet Tahoe 5.3L daily driver
  • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
  • Total GM diesel miles to date : ~950K
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Old 10-31-2006, 06:38 PM
mark45678 mark45678 is offline
Join Date: Nov 2000
Location: foxboro,ma.
Posts: 908

Back in 2004 GM changed the spec on the oil pump , I think they did this to help the cavitation issues. My 2001 had around 70 psi warm going down the road, the 2004.5 lly truck has right around 50 psi warm goind down the road. the LLY truck and the LBZ truck once the motor is broke in they are both the same. A long time ago Grumpy Jenkins said GM motors only need 10~12 psi of oil pressure for every 1000 RPM they turn! so if he is corect 25 psi is about all you need at cruise speed.

No Worries, RUN like some one else is paying for it!
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