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Old 09-04-2013, 06:32 PM   #1
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High oil pressure

Starting a few days ago, my oil pressure is running a bit high. It used to be that when I started my jeep up, the oil pressure gauge went to 40 and stayed there until I started driving. When I started driving the pressure would increase to about 50 psi and when I came to a stop it would drop down to about 30-35 psi.
Now, when I start her in the morning the oil pressure goes to almost 60. After the engine has warmed up the psi drops to a little above 50 psi while driving, but when I stop the psi only drops to a hair under 40.
The jeep has a wee bit over 256K miles on the engine. It's a 6-cylinder and for the past year or so I've been using Valvoline Max Life for the oil. I'm really hoping this isn't a sign the engine is getting ready to die on me. Am I looking at a really expensive repair? Any suggestions? I'm worried that she's getting ready to have a stroke of sorts...

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Old 09-05-2013, 05:34 AM   #2
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You should verify your pressure with a mechanical gauge first to see if it's a faulty gauge but it's probably nothing more than a bad oil pressure sending unit. I would pull and clean it along with checking the wiring before replacing it. I should be located above the oil filter housing on a 4.0.

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Old 09-05-2013, 10:29 AM   #3
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Turn the key to the ON position and check the gauge. If it reads pressure without the engine running, it's definitely the sending unit.
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Old 09-05-2013, 11:04 AM   #4
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With that mileage I would say the sensor would be your starting point. Engines with that sort of mileage done just start making higher oil pressure. To be safe you can always check the pressure with a mechanical gauge.
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Old 09-05-2013, 09:11 PM   #5
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Can anyone else confirm that your oil pressure should be at zero with the key turned to ON? Mine is at 60 when I do this. Bad sensor?
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Old 09-05-2013, 09:26 PM   #6
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Yes 0 when key is on my 2000 tj. Don't go up till I start it.
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Old 09-05-2013, 09:30 PM   #7
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Anyone want to guess what I'm replacing tomorrow night? Is an OEM switch worth the extra money versus one from O'Reilly's?
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Old 09-05-2013, 09:37 PM   #8
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Could be a bad filter too (bypass inside it)

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