Normal oil pressure for 4.0 - JeepForum.com
 
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post #1 of 10 Old 05-10-2007, 01:23 PM Thread Starter
rbluhm
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Normal oil pressure for 4.0

My oil pressure on my 99 4.0 seems low it is at about 20 at idle when warm and go to about 30 or 40 when driving. When outside temps ar higher it seems to be at the lowest. What is considered normal. I here some say put heavier oil in the summer, The garage is putting 5w30 when oil is changed.

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post #2 of 10 Old 05-10-2007, 01:33 PM
drivermod
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Thats plenty of oil pressure. Your fine.
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post #3 of 10 Old 05-10-2007, 01:33 PM
FrumpD63
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I have Mobil 1 5W 30 in my 2000 4.0 from the winter and I still get 30-40 idle and 40-55 cruisin. Swappin it out for the Mobil 1 High Mileage 10W-30 in a month or so, hoping itll remedy the steady drip i got from goin syn.
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post #4 of 10 Old 05-10-2007, 01:39 PM
UltimatE
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Pressure sounds fine, would recommend 10w30 for summer though

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post #5 of 10 Old 05-10-2007, 01:48 PM
DamianDeBe
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manual says 13 at hot idle is acceptable--that's abou where I'm at. So I think you are more that fine,
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post #6 of 10 Old 05-10-2007, 01:50 PM
Vaj
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Quote:
Originally Posted by rbluhm
My oil pressure on my 99 4.0 seems low it is at about 20 at idle when warm and go to about 30 or 40 when driving. When outside temps ar higher it seems to be at the lowest. What is considered normal. I here some say put heavier oil in the summer, The garage is putting 5w30 when oil is changed.
Sounds perfect. Use 5W30 all year round.
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post #7 of 10 Old 05-10-2007, 01:56 PM
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Somebody should sticky this topic.
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post #8 of 10 Old 05-10-2007, 02:23 PM
x99j
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you got more pressure at hot idle than most. my 99 runs 22psi at hot idle. these 4.0l can take almost 6-8psi before they will knock. and i personally have known a high mileage xj that was at 10psi hot idle for years with no ill effects. so as long as the motor is taken care of you should be at 20 hot idle for years! mike

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post #9 of 10 Old 05-10-2007, 03:01 PM
UltimatE
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My xj idles 38psi hot idle, 60 running

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post #10 of 10 Old 05-10-2007, 03:08 PM
basso4735
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yeah mines at 40 idle and 60ish driving.


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