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Unread 06-14-2011, 06:34 PM   #1
Badcompany
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1998 TJ Wrangler 
 
Join Date: May 2011
Location: Miramar, Florida
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What is the normal oil pressure?

I was to curious to know what the normal oil pressure should be for the 4.0. My oil pressure at idle is at the line between o and 40. While driving my pressure is at 40 to 45. Is this normal or there a serious problem going on here? I changed my oil switch. I just wanted to know if this is normal or not. Thank you.

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Unread 06-14-2011, 06:39 PM   #2
chris142
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Put a mechanical gauge on it and get back to us.
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Unread 06-14-2011, 06:39 PM   #3
durango-bob
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Zero can be a problem, but otherwise sounds about right.
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Unread 06-14-2011, 06:52 PM   #4
Robert J. yates
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13psi at idle is factory spec. Your guage may not be correct or else the oil pressure sender is possibly fragged and needs to be replaced. If you truely had zero... you would get a check guages light.
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Unread 06-14-2011, 06:52 PM   #5
SolidBrass
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10 @ 1000 RPM is normal. Nothing to worry about. (Zero is a problem) Jeeps have an 'honest' gauge that tells you what really is happening. Other vehicles don't and just tell you 'everything's fine' all the time to keep know-nothings from getting worried, in truth oil pressure changes with RPM's.
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Unread 06-14-2011, 07:08 PM   #6
Badcompany
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Thanks for the replies. I will have to pick up a mechanical gauge to test the true pressure since the gauge in the jeep is digital. It's my first jeep, just use to those v8's.
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