07 JK Rubi EATING oil

Bigf350sd

Bigf350sd

New member
Hi all, my 07 3.8 has 86,000 miles, and I have added FIVE quarts of oil in about 1,200 miles. Have seen posts on other forums, etc...about rings installed wrong, gaps lined up, control ring upside down, etc...
Has anyone else had this problem on their JK? I'm out of warranty, but if Chrysler had a bad run, or lot of these engines with piston rings installed incorrectly, I wonder if they'd step up to the plate and fix THEIR mistake?? I'm currently undergoing an oil consumption test, so jeep will at least have it documented.
 

Ask the dealership if there's a TSB (technical service bulletin) issued on the problem. Often times they will cover the problem if there's a TSB on it.

Vehicles have a federal 8yr/80k mile emissions warranty. If you're consuming that much oil maybe they'll repair it under the emissions warranty.
 
it sounds like carboned stuck rings not expanding to seal the cylinder walls.
it could also be valve seals.

check your intake for carbon thru the breather
check your radiator for oil in the water.
pull a spark plug and check for water in the combustion chamber

I assume with that consumption you see a plume of smoke out the exhaust? if so, expect your cat converter to be fudged as well.

you don't see a juicy leak at the crank seals, oil filter, or anything underneath?

engine rebuild.

I'm not a huge fan of aluminum engines per se... they warp long before a cast iron block will.



>I wonder if they'd step up to the plate and fix THEIR mistake??

you can't knee-jerk to that conclusion just yet... it's possible the oil was never changed and it's customer abuse rather than faulty manufacture
 

Well, the oil has been changed right on time at the dealership every time I have had it changed. There are NO leaks on it that I can see anywhere, and it doesn't smoke, or not that I can see out the mirror while driving or taking off. I KNOW it doesn't smoke when it's cranked up, I have watched for that. It's weird to me. I have heard that maybe the convertor is doing it's job really well, and getting rid of the smoke (?) but I don't know, that's a lot of oil. As far as the PCV Valve, it may very well be sucking it up, but I would think for the pcv valve to be sucking it up, that the rings would have to be bad in order for that much oil to form a mist, so to speak, and be sucked in. I know the oil is entering the valve covers to lubricate the valve train, but usually there is a baffle covering the pcv valve from underneath to prevent straight liquid oil from getting to it, therefore, I would think it would have to be either burning it, or being forced up to the pcv valve by possibly compression getting by the bad rings (?) or "Blow-By" as it's called. All just speculation or theory, until the oil consumption test is done, and the engine is torn down to check the rings, etc... I guess I could try the pcv valve, and maybe switch from 5w20 to 5w30 and see if it stops it from consuming so much, or slows it down, but I'd LIKE to know WHY it's doing it, and actually repair the problem. I'm just saying that with as many people I have seen with the same exact problem on other jeep forums, such as JKOwners, JK Forum, Wrangler Forum, etc...I don't think theres any way chrysler DOESN'T know about it, if it is in fact a bad run of engines, and I'm sure if so, they know by VIN numbers, exactly which jeeps those bad engines are in.
 
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