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Old 09-30-2013, 11:24 PM   #1
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Burning oil

I have a 2008 4 door wrangler. My check oil light came on and I am completely out of oil. I used synthetic last oil change and I should of had a good 3000 miles left. I don't see any leaks but I'm not sure why all my oil is gone. Does anyone have any ideas?

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Old 09-30-2013, 11:39 PM   #2
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I think Id be checking my oil more often than every 3000 miles or when the oil light comes on.

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Old 10-01-2013, 11:22 AM   #3
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Pull your spark plugs and see if they are fouled. Did you change the oil yourself or take your rig to an oil change shop?
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Old 10-01-2013, 06:32 PM   #4
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Quote:
Originally Posted by Big Cole View Post
Pull your spark plugs and see if they are fouled. Did you change the oil yourself or take your rig to an oil change shop?
This is a good point. A lot of the time those oil change shops will not put in enough oil. I always check my oil as soon as I leave the shop. Remember too, that synthetic oil is expensive, so they probably just didn't give you all the oil that you needed to save costs.

For the OP, you do have oil. There is no way you can drive the vehicle without it. Even if it is not showing on the dipstick. It is just very low. I would immediately drive to a auto parts store and buy three quarts of synthetic oil, at the proper weight. Put in two quarts and check your oil level. Then, add the third quart if the dipstick is still low.

Then, when you get home, check for leaks. One possibility is that they didn't put your oil filter on tight, and it is leaking.

If no leaks, then check your oil again in a couple of days. Monitor your oil regularly, and see if you are losing oil fast. If not, then likely the mechanics cheated you with not enough synthetic oil.
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Old 10-01-2013, 08:20 PM   #5
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I don't have that problem with the Jeep but my 3.8 in my Town and Country mini van has the same problem. It is the PCV valve. positive crankcase ventilation valve. They start acting up randomly. I took mine to the dealer to get it fixed under warranty and was told unless it uses 2 quarts in 3000 mile it is within factory specs. It just vents it up and is burned off in the Engine.
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Old 10-01-2013, 08:38 PM   #6
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Thicker oil
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Old 10-02-2013, 08:09 AM   #7
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I've read in a few posts that the V6's in the early JK's were oil burners. I don't have one so I can't speak from experience.
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Old 10-03-2013, 04:27 AM   #8
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Lots of threads on the JK forum about oil consumption in the 3.8L engines.....Lots of speculation about the causes, some are well documented, as Piston Rings installed wrong,PCV valve, Shrinking Intake Gaskets...Even Connecting Rods ...
It may be tooo late now since you ran it dry, but you better be pullin the dip stick once a week or more til you get a handle on how much it's using....
Get away from that 5-20 oil and go to a 5W or 10W-30 oil, believe me, life is MUCH better..
I have a 07 with 43K miles and Now that I have changed to 10W-30 I have very little oil consumption... You may have to go thru several brands before you find an oil that works for you...I went thru 3 brands before I found one that seems to be working for me.... Good Luck ! "BH"
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Old 10-03-2013, 07:35 AM   #9
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Originally Posted by Baby Huey View Post
Lots of threads on the JK forum about oil consumption in the 3.8L engines.....Lots of speculation about the causes, some are well documented, as Piston Rings installed wrong,PCV valve, Shrinking Intake Gaskets...Even Connecting Rods ...
It may be tooo late now since you ran it dry, but you better be pullin the dip stick once a week or more til you get a handle on how much it's using....
Get away from that 5-20 oil and go to a 5W or 10W-30 oil, believe me, life is MUCH better..
I have a 07 with 43K miles and Now that I have changed to 10W-30 I have very little oil consumption... You may have to go thru several brands before you find an oil that works for you...I went thru 3 brands before I found one that seems to be working for me.... Good Luck ! "BH"


And what brand worked best for you? I've seen a few with 08's claim that Castrol worked best for them.
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Old 10-03-2013, 11:10 AM   #10
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And what brand worked best for you? I've seen a few with 08's claim that Castrol worked best for them.
So far Castrol Extended Milage oil in the Green Jug has worked the best, or I should say I have had to add less between changes.....
This is a strange thing....You would think that if the engine uses oil it would use it at the same rate pretty consistently...I don't run the hell out of my rigs, I don't run it hard between shifts ( 6 speed )...
I can take road trips of 3-400 miles, over mountain passes and at interstate speeds and not use any oil.... Then I can make two short trips to a nearby town
and only go 7-8 miles in both directions and have to add 3/4 of a quart...
The exhaust is clean I just passed a DEQ emissions test for my new tags.
Yesterday I chugged around the coast range "Road Huntin" ( yea, I hate em too, but I have bad knees so I can't bust brush anymore... ) I used 4-low so I didn't have to ride the brakes, I put on 72 miles and didn't use any oil...
Thats a lot of going up and down very steep grades....
Good Luck..... "BH"
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Old 10-03-2013, 02:54 PM   #11
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I had the same problem, and ended up having to replace the PCV valve

PCV VALVE for 2008 Jeep Wrangler|4648973AD

Number #13 in the diagram...

I don't know what causes it to malfunction but apparently it's common.
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Old 10-03-2013, 02:58 PM   #12
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With that kind of oil use I'd be checking the oil every time I gas up. There were a lot of documented issues with Mexican assembled 3.8L engines having the rings installed upside down. They use a lot of oil as a result. I don't know if the 08's were part of it though. Google it you should come up with a lot of information about it.

I'd change the PCV valve make sure you buy an OEM part and not something from a parts store. You might also consider a piston soak, and trying a high mileage oil next time.
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Old 10-03-2013, 04:57 PM   #13
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I looked at a Mini Van Forum.... There was several threads about changing the PCV valve and they thought the problem was solved.....Only to find out a while later that the problem was back ....
I have not changed my PCV yet...
I did use "Sea Foam" in the engine oil just before a change. I drove it for a 100 miles, and pulled the plug and drained it. The oil was still pretty clean, I did not see any change due to Carbon deposits or sludge...My engine is clean inside.
I have not sucked "Sea Foam" into the intake system yet ( thru the Power Brake Vacuum hose) Then let it soak for a while and restart...This is supposed to clean and carbon deposits out of the piston ring grooves... Some guys swear by this method as a "fix"....
I just checked my oil today, I put another 73 miles on it chuggin around in the woods and driving home at 60mph.... Still FULL...
Thanks for the part Number for the PCV.... "BH"
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Old 10-04-2013, 04:57 AM   #14
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Read up on a piston soak it is much more effective at cleaning up the rings than Sea foam via a vacuum line. Don't get me wrong I'm not knocking Sea Foam its a good product. But piston soaks are much better for freeing up sticking rings, if that's your problem. In fact some people use Sea foam for piston soaks. If you plan on changing spark plugs that's a great time to do a piston soak. If you have any problems with doing it or want more info shoot me a PM and I'll walk you through how I do it.
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Old 10-04-2013, 06:10 AM   #15
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may or may not be of help but part of the problem is the Federal govt. They set the fuel mileage standards for vehicles, and as we all know Jeeps aren't up there at the top of the list for best mileage.

Anywho, manufactures use every trick they can think of to increase the mileage. Plastic bumpers, aluminum in place of steel, and they set up the engines "loose".

A "tight" engine, all very close tolerances, takes a tad more power/fuel to turn over then one that has larger tolerances in the bearings/rings/and such.

Problem with "loose" is they tend to use oil. I know for a fact Ford had right in the owners manual that a quart per 900 miles was absolutely normal usage. GM said a quart between 1000 and 1500.


It could be that folks are looking for a leak/usage problem that's built into the engine.
You just have to think about checking the oil a little better.

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