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Old 01-11-2018, 03:47 PM   #11
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Join Date: Sep 2016
Location: Stow, MA
Posts: 845
The oil pump pressure relief valve can be damaged or have debris stuck in it. That would be consistent with the symptoms. When the oil flow is low the leakage through the valve would be significant enough to lower the pressure. At higher RPM, and thus higher flow rates, the leakage would be insignificant enough to not affect the pressure.
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