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Got it, differential pressure, big difference!

Come to think of it, if in fact the bypass valve opens at 15psi system pressure, why couldn't you put the bypass valves going into the filters and the oil cooler so you would have direct flow in the system on startup and when the press hit 15psi, the filters would start to fill and the oil...

OK 4x4, how does the bypass valve differentiate between say 50psi system pressure and 15psi "backpressure" from the filters? Or does that mean that as soon as your system oil pressure reaches 15+psi that bypass valve will start to crack open and start bypassing some oil? BC