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A good rule of thumb is 10 lbs. pressure per thousand rpm. I don't like to see them fall below 15-20 hot, at idle, in gear, but anything above 60 lbs at wide open throttle is a waste of horsepower. Use oil viscosity to fine tune the pressure to desired limits. ie: 0w30 or 5w30 to lower the pressure, 15w40 or 30w to increase pressure. (Based on a standard of 10w30 or 10w40)
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