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Discussion Starter · #1 ·
What is the operating oil pressure at Idle for the LB7?

My oil pressure gauge reads between 30 and 60 at idle, and slightly above 60 once warmed up and at around 1800rpm.

A while ago it had a glitch where it would randomly show that I had "0" oil pressure, but I could tell by the way the engine was running that it was obvious I did in fact have operating pressures.

No dummy lights. Oil is at full mark. No fuel in Oil.
 

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Sounds about right-- The LB7 has higher pressure than the other Duramax engines.
 

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Discussion Starter · #3 ·
I'm a diesel tech, but I don't work on this stuff, so... 30psi seems CLOSE for an Idle pressure, but not ideal... and 60psi at 1800rpm (around 65mph) seems LOW for a mid-high idle.
 

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Mine will be around 40 at idle and 70-80 running down the highway at 70mph. jc1843 is right, the LB7 runs high oil pressure than the other ones.
 
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