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Using the "old school" rule of 10psi per 1000rpm, you really only need 7 psi at idle. As a matter of fact, the "stop engine-oil pressure low" message on the driver information center comes on at 7psi. Also most people don't know that there is a filter screen under the oil pressure sensor on the L99 to protect the solenoid valves in the VLOM. If that becomes restricted it will cause erratic and erroneous readings on your gauge.
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