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Old 02-18-2012, 12:29 AM   #1
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Oil Consumption

07 JK Sahara - 3.8 V6.

Today, the oil light flashed on the dash for just a second while I was going up hill, so when I got home, I checked it & found it to be over 3 quarts low! I have no idea how that could have occurred. I religiously change my oil at or about 3k, have no leaks, no burning of oil while running (no smoke), and I use 5w20 as recommended in the manual (though I choose synthetic).

Anyone else experience this at all??

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Old 02-18-2012, 12:41 AM   #2
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ya. i hear some jks burn through oil like crazy and others have no issues. what you might want to try is running 5W30 synthetic so it helps with consumption and engine noises (if your having any)

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Old 02-18-2012, 01:58 AM   #3
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Quote:
Originally Posted by Bigdawg0114 View Post
07 JK Sahara - 3.8 V6.

Today, the oil light flashed on the dash for just a second while I was going up hill, so when I got home, I checked it & found it to be over 3 quarts low! I have no idea how that could have occurred. I religiously change my oil at or about 3k, have no leaks, no burning of oil while running (no smoke), and I use 5w20 as recommended in the manual (though I choose synthetic).

Anyone else experience this at all??
If your were 3 quarts low, the oil just didn't disappear. Either you have a leak or the engine is using oil.
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Old 02-18-2012, 10:04 AM   #4
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Quote:
Originally Posted by SilverRubi

If your were 3 quarts low, the oil just didn't disappear. Either you have a leak or the engine is using oil.

Not trying to be a smarta*s, but yes, I kinda figured it was one or the other ;-)

I guess I was trying to get an idea from others here on the forum as to if this is a known and/or common issue, or possibly an issue with my rig. That being said, Pluke answered my question... thanks
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Old 02-18-2012, 10:33 AM   #5
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Lots of 07's have that problem; it is a known and well documented problem. It is really important to check your oil often so you will never be three quarts low again, unless you just don't add it when it is needed.
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Old 02-18-2012, 02:13 PM   #6
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Originally Posted by tjt94
Lots of 07's have that problem; it is a known and well documented problem. It is really important to check your oil often so you will never be three quarts low again, unless you just don't add it when it is needed.
Thanks tj. I'm meticulous about my vehicles both mechanically & visually, so I'll stay atop this issue for sure!
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Old 02-18-2012, 03:16 PM   #7
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Quote:
Originally Posted by Bigdawg0114 View Post
Not trying to be a smarta*s, but yes, I kinda figured it was one or the other ;-)

I guess I was trying to get an idea from others here on the forum as to if this is a known and/or common issue, or possibly an issue with my rig. That being said, Pluke answered my question... thanks
No problem, I wasn't trying to be a smartass either. Just that you said it wasn't leaking and wasn't burning it.
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Old 02-18-2012, 03:17 PM   #8
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Not sure about your state's lemon laws (or if you are even the original owner), but Nissan had to buy back my '06 350Z due to oil consumption under the lemon law.
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Old 02-18-2012, 03:59 PM   #9
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hi, my last jeep was a 07 jk i had no oil loss at all, take a look under
around the oil pan, and oil filer, how many miles, if you are the first owner
and have less than 50k miles, you may get help from ur jeep dealer, it;s worth a try....
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Old 02-18-2012, 04:05 PM   #10
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You're most likely using (burning) oil. You're not going to see it. Chrysler believes it's within spec for a 3.8 to burn 1qt. every 1,000 miles. Everyone else knows that's insane, but it's their bat and ball. Keep a record of it and if it burns more than that you might have recourse, meaning you may get authorized for a consumption test. If it's at the threshold you'll just have to keep adding.
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Old 02-18-2012, 10:44 PM   #11
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Holy hell... a quart every 1000 miles?? Yeah, insane to say the least! I'm moving up to 5w30 to see of that helps at all.
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Old 02-19-2012, 11:54 PM   #12
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Originally Posted by kik View Post
Chrysler believes it's within spec for a 3.8 to burn 1qt. every 1,000 miles.
Link? Is this documented somewhere? Total BS on Chrysler's part.

My 09 JK used no oil. If this is only on 07's then it's a known issue, and I'd be going after a new engine under warranty if it were me, and I'm sure many other owners would have. You wouldn't need to add that much oil on a beater with 200,000 miles on it. If you were using that much you'd be seeing smoke behind you.

I find it hard to believe that some change was made with the 3.8 in 08 that caused it to not use oil.
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Old 02-20-2012, 05:28 AM   #13
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Originally Posted by pdubois64 View Post
Link? Is this documented somewhere? Total BS on Chrysler's part.


I find it hard to believe that some change was made with the 3.8 in 08 that caused it to not use oil.
If you do a search you will find there were some issues involving incorrect installation of the oil rings on pistons for some engines that were assembled in Mexico in 07 and 08. These became oil users. For some reason there was not a recall though. There are members here and on other forums that really blew up the boards with their claims that all of the 3.8's are crap and will use oil. I have an 09 and it is not an oil user; it takes about 1/2 quart every 3000 miles in extremely hot conditions. That is very acceptable.
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Old 02-20-2012, 07:45 AM   #14
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Originally Posted by pdubois64 View Post
Link? Is this documented somewhere? Total BS on Chrysler's part.

My 09 JK used no oil. If this is only on 07's then it's a known issue, and I'd be going after a new engine under warranty if it were me, and I'm sure many other owners would have. You wouldn't need to add that much oil on a beater with 200,000 miles on it. If you were using that much you'd be seeing smoke behind you.

I find it hard to believe that some change was made with the 3.8 in 08 that caused it to not use oil.
There are a number of cases of oil burners post 08 also. It's not limited to only 07 and 08. As far as being documented, just check with any dealer they'll be more than happy to inform you of Chrysler's 1 per 1,000 policy. My 10 doesn't use any. There have been some problems with engines assembled in Mexico as was stated. Your window sticker will tell you where your engine and trans was assembled without having to try and find the code on the block.
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Old 02-20-2012, 11:27 AM   #15
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First try switching to 5W30 as this helped with my oil consumption on my 08 JKU. I was loosing about 1.5 Quarts every 3000miles. Switched to 5W30 and I have next to nothing for oil consumption.

If you still are having oil consumption issues look at switching out your PCV valve. If your PCV valve has failed, it isnít sucking oil fumes out of the crankcase, but instead, itís inhibiting their removal and creating pressure inside the crankcase. This pressure helps force oil past the piston rings and into the combustion chamber.
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Old 02-20-2012, 11:47 AM   #16
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If the engine was assembled in Mexico as many 3.8L engines were that could be your problem. The rings were installed upside down and are the cause of the high oil consumption. Check the vin # for a clue as to where the engine was assembled. It is well documented and mentioned more than once on this site. I'm not sure about the code for an engine assembled in Mexico but a quick search should tell you. HTH
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Old 02-20-2012, 02:17 PM   #17
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I have an 07 JKU and use Mobile 1 full syn and in the last 3000 miles used a half quart.
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Old 02-20-2012, 08:17 PM   #18
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Hey all, I have an 09 that was a chronic oil consumer. At 70k I finally reached my frustration point and brought it to my dealer. I'll give Fields Jeep (IL) kudos... They had it for an hour, called me and asked for me to bring in oil change records (did most oil changes away from dealer) and next thing you know, no fight at all-new engine installed.
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Old 02-20-2012, 10:44 PM   #19
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Originally Posted by Cigar196
Hey all, I have an 09 that was a chronic oil consumer. At 70k I finally reached my frustration point and brought it to my dealer. I'll give Fields Jeep (IL) kudos... They had it for an hour, called me and asked for me to bring in oil change records (did most oil changes away from dealer) and next thing you know, no fight at all-new engine installed.
When you say "chronic", what exactly do you mean?

Apparently Chrysler feels 3 quarts consumption in between regular oil changes (every 3k) is within acceptable levels. Was your more, less? Did they mention that to you when you addressed the problem with them? If they only had it an hour before authorizing an engine swap, I'd say no, and could only assume there was no consumption test conducted either...
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Old 02-20-2012, 11:08 PM   #20
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Yes, Chryslerls official view is 1 quart of consumption per 1K miles is ok. I have heard mention of the Mexico engine fiasco on here too but then others said it wasn't true. If it was I would think the problem would be isolated to one model year not several. When I was on here researching before buying my 2011, there were a few members with 2010s that had excessive oil consumption.
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Old 02-21-2012, 04:04 AM   #21
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Quote:
Originally Posted by Bigdawg0114

When you say "chronic", what exactly do you mean?

Apparently Chrysler feels 3 quarts consumption in between regular oil changes (every 3k) is within acceptable levels. Was your more, less? Did they mention that to you when you addressed the problem with them? If they only had it an hour before authorizing an engine swap, I'd say no, and could only assume there was no consumption test conducted either...
Mine had consistently used at least 1 quart every thousand miles from about 20k forward, but starting at about 50k the oil consumption increased to the point that every other gas fill up I checked the oil and was down half a quart each time. The final straw to me was being 3 quarts down in between that same every other full up. When I called for the service appointment they first mentioned a consumption test, but didn't do one due to my oil pressure being deemed too low. That was when they called asking for the receipts so Chrysler could authorize engine replacement. The engine tear down revealed damaged crank and can bearings.
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Old 12-02-2012, 09:04 PM   #22
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A couple possibilities

I am losing about 3 Qts in between every oil Change for the last two oil changes. No leaks and I don't beleive its burning because there is no smoke. I was told to check the both the radiator and transmission, oil could possibly be leaking into those because of a head gasket. Any Ideas?

I have about 85,000 miles and have used Full Synthetic since it was new and changed the oil on time.
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Old 12-02-2012, 09:32 PM   #23
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If oil is leaking into the coolant you will notice a nasty mess when you remove the radiator cap. I would be inclined to think either a bad PCV valve or a leaking intake manifold gasket.
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Old 12-03-2012, 12:29 AM   #24
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If you do a search you'll find tons of threads about JK 's eating oil on this forum. Actually they are notorious with the 3.8's
My '07 X was burning a quart every 600 miles, at 40 K I had warranty and the dealer after a consumption test put in a new engine, which so far after 15K it doesn't burn a drop of oil. I use 5W20.
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Old 12-03-2012, 01:10 AM   #25
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Yep, if you have a 3.8L and it's New to you ....(used rig what ever...) Then ya better be checking the oil...!
Mine uses lots, no leeks , no smoke.....
So far I have tried the Sea-Foam in the crankcase (oil) and it's still in there with only 50 miles so far...Oil is CLEAN and tacky...Due for a change but I add enough between changes to just change the filter and call it good...(no, I don't do that, but it is tempting).
Mine has 40K miles.... I'm using "High Milage" engine oil and it has reduced the consumption quite a bit...
If you are interested there has been lots of threads posted here about the oil issue in the 3.8L engines.... Also on other forums such as the Mopar Mini van forums...
Here is some observations: Oil Consumption causes
1) Mexican engines, had piston rings installed up side down
2) Intake manifold leaking internally, sucking oil into the intake ports.
3) Bad PCV valve, (these were changed and oil consumption still there)
4) piston rings carboned up , fix was SEA-FOAM additive
5) Synthetic oil used and oil consumption is gone...
Good luck with yours, your lucky the oil light worked !! I pack a couple bottles of 10-30 with me, I suggest you do to.....Cheaper than a engine....."BH"
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Old 12-03-2012, 05:43 AM   #26
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I am losing about 3 Qts in between every oil Change for the last two oil changes. No leaks and I don't beleive its burning because there is no smoke. I was told to check the both the radiator and transmission, oil could possibly be leaking into those because of a head gasket. Any Ideas?

I have about 85,000 miles and have used Full Synthetic since it was new and changed the oil on time.
You're really not going to see blue smoke like you used to see in pre cat vehicles. The heat the cat puts out as the exhaust goes through it burns off the oil to the point that there really isn't visible smoke. The down side is that it shortens the life of the cat. It sounds like you're burning oil. If it's in 1 per 1,000 spec the only thing you can probably do is replace the PCV and try switching to 5W30.
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Old 12-04-2012, 07:51 AM   #27
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That makes sense about the catalytic converter taking care of the smoke. What do you think is the most likely cause of the burning then, bad PCV? I have been using Full Synthetic since the vehicle was brand new.

Not to get into the pros and cons of these but just for info I also added a Cold Air Intake and a throttle body spacer when when I first got the jeep in 2008, I clean the filter about every 3 months.
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Old 12-04-2012, 08:01 AM   #28
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I suspect a leaking intake manifold gasket.
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Old 12-04-2012, 10:01 AM   #29
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I visited my Jeep delaer last week and mentioned I'd heard the JK uses 1qt/1000 miles and he said he could live with that! HOLY CATS!!! That's a lot of oil, that means it's automatically an oil change every 5000 miles, now if you could just get a filter in the mix! jj
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Old 12-05-2012, 01:28 PM   #30
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I suspect a leaking intake manifold gasket.
Wouldn't that cause there to be oil in the coolant? or some other contamination? ....Just going by what I've read online.

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