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Unread 12-26-2010, 01:46 PM   #1
LRMark26
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Oil Pressure = 80 Bad??

Is running at high oil pressure bad? What kind of damage may it cause?

My oil pressure has been reading 80psi since I changed my oil last week. Changed oil (10W-30) and Oil Filter. It is 80 as soon as I start it. After driving about 20 miles, side roads and expressway, 10mph - 65mph, it will lower to about 65psi when I slow down getting off the expressway and will go back up slightly.

I looked through the service manual and could not find anything regarding High Oil Pressure only Low. I know the pressure relief is at 75psi, obviously this is not working.

Any thoughts?

(2000 Wrangler, 4.0 Manual)

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Unread 12-26-2010, 01:58 PM   #2
havasu
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Was your oil pressure OK before changing the oil? All I know is that jeeps are notorious for malfunctioning and poor working gauges.
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Unread 12-26-2010, 02:02 PM   #3
LRMark26
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As far as I know the gauge was functioning / oil pressure was fine before the oil change. I didn't notice the pressure being at 80.
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Unread 12-26-2010, 02:04 PM   #4
wushaw
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Screw in a mechanical gauge and re-check.
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Unread 12-26-2010, 02:12 PM   #5
havasu
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^ This is your best bet!
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Unread 12-26-2010, 02:16 PM   #6
lakailimited06
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mine has been doing the same thing..not sure when it really started but i did change the oil 10w30 and mobile 1 filter (like usual every 3500miles) and it had no effect...it has been 20-30* here idk about florida though lol...i dont recall this happening in the summer so im just assuming its the cooler weather or the sending units bad?

once i drive around a bit the oil does drop down between 55-65 and goes back up to 75 when on the highway...sorry to hijack just watching this thread as well for help...
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Unread 12-26-2010, 02:24 PM   #7
LRMark26
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The temps have been chilly here, 20's - 30's in the AM and 50's - 60's in the afternoon. The pressure is reading high in the afternoon as well.

Is hooking a mechanical gauge up easy? Still a very very fresh do it yourself'r.
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Unread 12-26-2010, 02:39 PM   #8
wushaw
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HF has one. All ya do is unscrew the electrical sending unit and screw in the mechanical gauge and observe the reading.
Engine Oil Pressure Test Kit
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