02 Jeep Grand Cherokee Oil pressure drops after 20mi drive???

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jak0412

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I have a 2002 Jeep Grand cherokee and when i drive a short distance (10mi or less) the oil pressure is fine, but when i drive more than that the oil pressure drops to zero when i stop. I`ve just changed the oil and the fluid is where it should be. any ideas?
 
Sounds like it is your oil pump when the vehicle is cold the oil is thicker there for you have good oil pressure. when the oil warms up it gets thinner and you dont have any oil pressure. Change the oil again and put in a heavier weight oil and see if that helps if not get a oil pump
 
Maybe your oil filter is blocked, or the bypass valve in the oil pump is not closing properley.
 
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