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Old 06-02-2012, 07:18 PM   #1
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How many quarts of oil in your 4.0?

Hey all:

Just changed all of my fluids today for the first time since buying my '99 TJ last week. Wanted to make sure everything has clean fluids.

In reading the manual, it recommended 4-6 quarts of 10w30. After four quarts it looked low. Added one more; held steady at five. It's very hard sometimes to read the dipstick after a fresh oil change, so I'm not exactly sure where it lies on the dipstick.

Just started it after replacing all of the fluids: crankcase oil, both differentials, transfer case, and manual tranny (all Royal Purple fluids).

What concerns me a bit is that the oil pressure seems to be riding a little higher than normal. I think it was fluctuating between 35-45psi before the change. Now it's holding steady at about 55 psi. Could this be due to something I did? Is 55 psi on the oil pressure something to be concerned about?

How many quarts of oil do you add with a full oil change on your 4.0 (with new filter).
Thanks

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Old 06-02-2012, 07:25 PM   #2
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6 and I pour a little of that 6 in the new filter.

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Old 06-02-2012, 07:26 PM   #3
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Originally Posted by mrpowerz13
6 and I pour a little of that 6 in the new filter.
Exactly what I do.
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Old 06-02-2012, 08:59 PM   #4
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From my '01 manual,
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Old 06-02-2012, 10:13 PM   #5
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From my '01 manual,
Thanks for the info. I'm still wondering about the oil pressure. I guess if it's still in the green, it's still in the green.
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Old 06-02-2012, 10:28 PM   #6
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I wouldn't worry about your oil pressure, 20 to 65psi is normal. Your Jeep is just happier with fresh oil
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Old 06-02-2012, 10:31 PM   #7
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i had the same problem with my 93 4.0 but it eventually came down after about a week of running...
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Old 06-02-2012, 10:56 PM   #8
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Exactly what I do.

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Old 06-02-2012, 11:10 PM   #9
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Thanks guys. That makes me feel a little better.
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Old 06-02-2012, 11:11 PM   #10
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my book tells me 5 quarts
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Old 06-02-2012, 11:34 PM   #11
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my book tells me 5 quarts
That would be for the four banger. The six cylinder takes six quarts. :-)
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Old 06-02-2012, 11:59 PM   #12
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Put 4-5 qts in , run your engine for a minute, shut it off and check your level... add more to top it up... then run and check your oil level again. DO NOT OVER fill as its not good for your engine...
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Old 06-03-2012, 12:21 AM   #13
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The oil is so clean on the stick, I sometimes have to drive about a week before I can get a good read of the level. It's interesting to note that even the most advanced cars have no way of reading oil levels from the driver compartment. It seems that it would be easy to put a sensing unit in the oil reservoir.
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Old 06-03-2012, 01:06 AM   #14
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6 and I change the oil filter also and every other oil change I change the airfilter as well.
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Old 06-03-2012, 01:25 AM   #15
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There is no need to experiment by adding 4 quarts, checking afterwards, then adding another, and then adding 1 more so it has 6 quarts.

The bottom line is the 4.0L engine holds 6 quarts. No more, no less.
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Old 06-03-2012, 03:00 AM   #16
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Quote:
Originally Posted by AZ Greeen Jeep
The oil is so clean on the stick, I sometimes have to drive about a week before I can get a good read of the level. It's interesting to note that even the most advanced cars have no way of reading oil levels from the driver compartment. It seems that it would be easy to put a sensing unit in the oil reservoir.
Its either the new Ford explorer or the Ford Edge or the volts wagon suv that can read oil levels and display in on screen inside car

EDIT: turns out a few cars have this feature. Audi A5's have it apparently http://blogs.insideline.com/roadtest...oil-level.html
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Old 06-03-2012, 03:08 AM   #17
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Your oil pressure is probably reading higher because the new, clean oil is thicker than the old dirty oil.
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Old 06-03-2012, 05:48 AM   #18
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Your oil pressure is probably reading higher because the new, clean oil is thicker than the old dirty oil.
x2. Old oil gets broken down and becomes runny, hints why you have to change it.
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Old 06-03-2012, 12:49 PM   #19
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Quote:
Originally Posted by AZ Greeen Jeep
The oil is so clean on the stick, I sometimes have to drive about a week before I can get a good read of the level. It's interesting to note that even the most advanced cars have no way of reading oil levels from the driver compartment. It seems that it would be easy to put a sensing unit in the oil reservoir.
My buddy's 05 BMW 325i has no dipstick. It's all done inside from the drivers seat.
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Old 06-04-2012, 08:06 AM   #20
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Originally Posted by Jerry Bransford View Post
There is no need to experiment by adding 4 quarts, checking afterwards, then adding another, and then adding 1 more so it has 6 quarts.

The bottom line is the 4.0L engine holds 6 quarts. No more, no less.
Exactly, poor 6 in and go. Your wasting time adding and checking...
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Old 06-04-2012, 09:09 AM   #21
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Originally Posted by Jeepin9910 View Post
My buddy's 05 BMW 325i has no dipstick. It's all done inside from the drivers seat.
Yep you have to count that the oil level sensor never fails on those. No way to know unless it trips the light.
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Old 06-04-2012, 01:12 PM   #22
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Yep you have to count that the oil level sensor never fails on those. No way to know unless it trips the light.
Exactly what I told him. He said a new one was around $300 and that doesn't count labor. Oh well he's got money like that though lol

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