Very Low Oil Pressure in New Engine

"I'd have the pan down before I ran it much more! Something changed.

Given your clearances, I would expect the hot idle oil pressure to drop to 20-25, but with a HV pump it should pick up to whatever the bypass spring is set at by 1500 - 2000 RPM or so.

If I were a betting man, I would put money on something keeping the bypass valve from completely closing since oil pressure is rising with RPM (should come up to normal and level off by 3000 RPM or so). Sadly, Melling's quality control isn't what it once was and their pumps should be disassembled and inspected before installing. Sort of a trust but verify thing (like Eddy float levels)."


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