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Oil Pressure
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<blockquote data-quote="Dsth" data-source="post: 1676591" data-attributes="member: 38038"><p>hopefully it is an easy fix like D2Cat posted. I suspect the change from conventional oil (CO) to synthetic oil (SO) is contributing to your problem. I recommend that owners should decide when the vehicle is new whether they want CO or SO and not change after the first oil change. your 2004 jeep most likely came with CO from the factory. CO and SO have completely different chemical makeups and an engine that has had CO in it for a period of time builds up a thin layer of lubricant on the internal moving parts of the engine. a film too small to see with the naked eye, but it is there. the chemicals used to make SO dissolves that oil film; therefore increasing the clearance between the moving parts. we are talking about .001s of an inch of clearance for bearing clearances. Combine the extra clearance with the easier flow ability of SO and you have problems like you mentioned. Changing the sending unit would be the first thing to try. If that is not the problem, it will probably be an expensive fix if you plan to drive for another 155K. if you want to just drive until the end, you could drain and refill with a higher viscosity oil to help the low RPM oil pressure. although it is not recommended, you could switch back to CO and see how your pressures look. certainly it could be a completely different cause so please keep us posted.</p></blockquote><p></p>
[QUOTE="Dsth, post: 1676591, member: 38038"] hopefully it is an easy fix like D2Cat posted. I suspect the change from conventional oil (CO) to synthetic oil (SO) is contributing to your problem. I recommend that owners should decide when the vehicle is new whether they want CO or SO and not change after the first oil change. your 2004 jeep most likely came with CO from the factory. CO and SO have completely different chemical makeups and an engine that has had CO in it for a period of time builds up a thin layer of lubricant on the internal moving parts of the engine. a film too small to see with the naked eye, but it is there. the chemicals used to make SO dissolves that oil film; therefore increasing the clearance between the moving parts. we are talking about .001s of an inch of clearance for bearing clearances. Combine the extra clearance with the easier flow ability of SO and you have problems like you mentioned. Changing the sending unit would be the first thing to try. If that is not the problem, it will probably be an expensive fix if you plan to drive for another 155K. if you want to just drive until the end, you could drain and refill with a higher viscosity oil to help the low RPM oil pressure. although it is not recommended, you could switch back to CO and see how your pressures look. certainly it could be a completely different cause so please keep us posted. [/QUOTE]
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