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The oil pressure is created by the oil pump which is mechanicly driven inside the engine. When oil is cold it is thicker so oil pressure is higher, as it warms it thins and lowers the pressure slightly. When you rev the engine up the oil pump pumps faster, therefore raising the pressure in accordance with the rpm. Those readings sound fine to me. Hope this helps

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โˆ™ 2006-04-11 08:02:44
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Q: What would cause the oil pressure on a 96 jeep Cherokee to go from 45-60 then slowly climb up to 80 psi and then come back down again when you let off the gas?
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