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Old March 26th, 2012, 09:45 PM   #1
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Exclamation Oil Consumption Test

Last Wednesday I read in another thread how someone wifes 08JK was chowing through a quart of oil every 1,000 miles by the 45K mark and out of curiosity I checked mine the following Sunday.
Down 2 quarts with 2,500 miles on this oil change and no leaks.
The Jeep has 47,500 miles on it.
I took in in to the dealer to have some unrelated work done (EGR Valve) and told them about the disappearing oil. They're now doing an oil consumption test.
I have to take it back 1,000 miles from now and every 1,00 miles till the next change to have the oil measured or otherwise checked for depletion by the dealership. =(

After reading about the problem here I started researching it. I found dozens of threads on several Jeep forums about this problem. (UGH!) There are mixed comments on how its been dealt with...
Some have "fixed" the problem by simply switching the 5w20 oil for 5w30( which the dealership did) A few have new motors, and others are still fighting to have the problem resolved.

Is anyone else here who owns a JK having this problem?
If so, what has your experience with the dealership been like or how did you resolve the issue?
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Old March 26th, 2012, 09:57 PM   #2
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Its a jeep thing get used to it. Mine uses more than that in 3k miles.
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Old March 26th, 2012, 09:58 PM   #3
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Originally Posted by GREASYHANDS View Post
Its a jeep thing get used to it. Mine uses more than that in 3k miles.
yours is also an OLD Jeep and thats to be expected.
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Old March 27th, 2012, 09:05 AM   #4
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It is probably the PCV system that is doing it: Yet another "feature" you can thank the EPA for.

The vapors of the PCV system are considered a pollutant, so they get sucked back into the intake and burned during combustion. Since it is considered a pollutant, should the PCV hose become disconnected, the driver has to be "notified" somehow. Usually this is done with OBD and the check engine light, however, it is quite expensive to use actual physical equipment to monitor the PCV flow and make sure it is always connected.

The EPA allows the manufacturers a small loophole to save money and effort: design the PCV system in such a way that if it becomes disconnected, the engine will stall and be very hard to keep running. Awesome, I know, but we're kinda forced to do it if we want to sell cars.
So...now that we have PCV systems that flow so much, there exists a greater chance to suck oil vapor out of the engine where it can collect in the intake manifold and hang out. It also just gets sucked into the cylinders and burned.

I'll be interested to see what they to to measure oil consumption.
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Old March 27th, 2012, 09:13 AM   #5
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This could be as simple as looking at the dip stick or as complicated as actually draining and measuring the oil every 1,000 miles.
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Old March 27th, 2012, 09:21 AM   #6
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1 qt per 1000 miles is not a issue, considered normal
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Old March 27th, 2012, 09:27 AM   #7
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Quote:
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1 qt per 1000 miles is not a issue, considered normal
By what standards is this normal?
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Old March 27th, 2012, 09:35 AM   #8
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Quote:
Originally Posted by curbdog17 View Post
By what standards is this normal?
X2
My 96 ZJ used an immeasureable amount of oil between changes.
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Old March 27th, 2012, 09:49 AM   #9
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Chrysler warrantee, anything more is something physically wrong
But strange thing is when you have 4.5 quarts of oil and they recommend 5000 mile changes
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Old March 27th, 2012, 09:56 AM   #10
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It just seems rather odd to me that this just all of a sudden became an issue.
I've owned this Jeep since new and had never had any oil just disappear...
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Old March 27th, 2012, 10:03 AM   #11
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could be the oil your using? when I was wrenching at the dealer we would find that cheap no brand oil in some cases would cause the engine to burn oil. seems the quicky lube places were buying recycled oil and running that in some cases. it would end up costing more in the long run.
as for duration between changes? I go as much as 5000 without issue. some will tell you 7500. just use a good quality oils.
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Old March 27th, 2012, 10:07 AM   #12
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Old March 27th, 2012, 10:14 AM   #13
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NORMAL OIL CONSUMPTION: Below are industry standards for normal engine oil consumption: Mileage below 50,000: Normal oil consumption is one quart for each 1,000 miles driven. Mileage above 50,000: Normal oil consumption is one quart for each 750 miles driven. TEST TO DETERMINE ENGINE OIL CONSUMPTION: Operate engine to normal operating temperature. Fill engine oil precisely to FULL mark on dip stick gauge. Use paint pen to mark the engine oil drain plug to prevent tampering. Check engine oil level after 1.000 miles driven. Refer to normal engine oil consumption listed above.
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Old March 27th, 2012, 10:27 AM   #14
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Quote:
Originally Posted by Yetti View Post
could be the oil your using? when I was wrenching at the dealer we would find that cheap no brand oil in some cases would cause the engine to burn oil. seems the quicky lube places were buying recycled oil and running that in some cases. it would end up costing more in the long run.
as for duration between changes? I go as much as 5000 without issue. some will tell you 7500. just use a good quality oils.
We only use Mobil1
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Old March 27th, 2012, 10:30 AM   #15
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GM says anything over 1 quart per 2,000 miles is abnormal.

My Caliber SRT4 burned about a quart every 2,000 miles which wasn't shocking being a forced induction engine. Now what gets me is the 3.6L in my CTS is burning a half quart to one quart of oil every 1,000 miles. I've been monitoring it and may be taking it to the dealer for this relatively soon.
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Old March 27th, 2012, 10:33 AM   #16
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2 quarts for 2500miles is not normal. I thought my 06 4runner was bad down a quart after 7500miles( using synthetic)
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Old March 27th, 2012, 10:44 AM   #17
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Wifes 08 jk about 1 quart down 5000 miles just checked it last night after reading said post. Using amsoil. P.O. said he use Mobil 1 in it when he had it.
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Old March 27th, 2012, 10:48 AM   #18
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Quote:
Originally Posted by Porscheguy View Post
2 quarts for 2500miles is not normal. I thought my 06 4runner was bad down a quart after 7500miles( using synthetic)
Exactaly.
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Old March 27th, 2012, 10:51 AM   #19
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Quote:
Originally Posted by IFS SUCKS View Post
Almost funny.
keep trying.
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Old March 27th, 2012, 11:16 AM   #20
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Mine has been down about 1/3 quart every 1,000 miles. Using mobil 1 5w-20, going to try 5w-30 next. Currently 73,xxx miles

This is the first vehicle I've had to add oil to between changes
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