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The first time, I thought it was the oil pressure sending unit, so I replaced it. New sending unit was still reading 80 psi (maxed out). Last night, the engine ground to a halt, despite good maintenance with Mobil 1 synthetic oil. I think the high pressure indicates blockage in the oil system, causing oil starvation somewhere in the engine. I think mine was in the lifter area, because they kept getting louder before the engine failed. High pressure is a big problem, in my experience.

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Q: Why does my 1999 jeep grand Cherokee have high oil pressure?
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