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Joshua, GM Performance Tuner
Category: Chevy
Satisfied Customers: 129
Experience:  Extensive Training in GM engine management systems & performance Tuning.
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what is the normal oil pressure for the 6.6 lly duramax diesel

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Submitted: 9 years ago.
Category: Chevy
Expert:  roadsidejerry replied 9 years ago.
A good rule of thumb is 10lbs per 1000 engine RPM on a warm engine.
Expert:  Joshua replied 9 years ago.
The 2001-2004 LB7 Duramax 6600 operates with a high oil pressure, running somewhere in the 60 psi range when hot. This high oil pressure produces more oil flow that is used to cool the pistons and better lubricate other parts of the engine, which adds durability. Experts has suggested that this high volume and pressure can cause an occasional air bubble to pass through the crankshaft oil galleries, which then "pops" under compression loads in the rod and main bearings. We're told this condition has no short-term or longterm effect on engine durability. GM reduced the oil pressure on later LLY & LBZ engines. We suspect they did this to reduce the ticking noice.

Hope this helps,
Joshua T. Pool