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Stock JK Tech Bulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
View Poll Results: (Check all that apply) My Jeep Wrangler has between 30K and 50K miles, and...
I have no engine issues
85.67%
I have engine issues, and I use 5W-20 and have no engine mods or water events
10.92%
I have engine issues, and I use a different weight oil
2.05%
I have engine issues, and I have engine mods
2.05%
I have engine issues, and have hit some major water obstacles
0.68%
Multiple Choice Poll. Voters: 293. You may not vote on this poll

30K - 50K mile engine issues poll

Old 08-05-2010, 11:44 AM
  #21  
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39.5k engine dead. Full synthetic 5w 30 since the second oil change @4k first oil change was at 1k.

I am now fighting Chrysler/Jeep in court, just filed the paperwork. They denied me per the DM because they "sprayed a chemical in the engine and found a small amount of sludge" When i asked what could be the cause they said lack of maintnence. I asked about my service records that i showed them and they told me they didnt care about my service records.

When i finally had it towed home two weeks ago, I read on the service report that the dealership is now stating for their records that it came in with no oil. Which is a crock of Sh**. When they first denied me, The day after i brought it in, they said it was because i hadnt changed my oil in a very long time. When i showed them it had been changed three weeks prior and after fighting with them they agreed to an oil test. The delayed me over a month to give me the rejection from the DM. Come to find out no oil test was ever done.

If anybody has any help please let me know. otherwise i am leaving up to the lawyers which from what i am being told will take a very long time(up to a year).

Anyways, be on the lookout for my Hemi build in the Xtreme Forum. I am clearing out the garage and taking out the 3.8 this weekend.

Shawn

Also, I have the lifetime waranty.
Old 08-05-2010, 12:49 PM
  #22  
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Thumbs up

30,000 Miles no issue 5w20 Motorcraft SYN. @ 5,000 mile changes (Same as with my F-150)
Old 08-05-2010, 01:57 PM
  #23  
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No engine issues but I did need a new slave cylinder at 28,000. The dlr replaced the Slave Cylinder(leaking) and also the Master Cylinder in case it was leaking. They also ordered new Rubi stickers for me because mine are starting to peel off.




5w 20
K&N cold air kit ( on during dlr visit )
Hypertech Max Energy ( program in the ecm and I left the programmer on the seat during dlr visit )
Old 10-31-2010, 04:14 PM
  #24  
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47,000 miles and burning 2 to 2.5 quarts of oil every 3000 miles. I do not wheel it, it is my daily driver. There are no mods to the engine. I have a mild lift and run rubi wheels with the 32 inch BFG's. Going in for oil consumption test next week. I run Valvoline full synthetic and change the oil every 3k along with a new K&N filter.
Old 10-31-2010, 07:55 PM
  #25  
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Just under 33K and so far no engine issues.. I have however had a few clutch issues.. The slave cylinder blew out about a 1000 miles ago, which was replaced under warranty. Now, I have a very noticeable clutch pedal vibration and can't figure out what is causing it.
Old 10-31-2010, 08:00 PM
  #26  
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76K miles and no oil use between changes.
Old 11-10-2010, 09:59 AM
  #27  
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Default 53,000 & Engine Is trashed

Just got the bad news. Have a 2007 unlimited ruby lifted with all the goodies @ 53,000mi and the engine is shot with spun bearings. Did Mobile 1 syn oil changes like clockwork since day one but apparently that doesn't matter. It started sucking oil down like gasoline until the oil light finally flashed on the dash.

Got a quote of $5800 from the jeep service center. They sounded as if they had never heard of the problem. I think I might just have to get a short block, check the heads and such and bolt it all back together. How do we usually go about pulling the the JK engine? Is it easy enough to unbolt the trans and pick it out the top?

Last edited by HighCountry; 11-10-2010 at 10:45 AM.
Old 11-10-2010, 05:19 PM
  #28  
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Just hit 36000 use to be down 2qt at even oil change now use 5w30 max life running good. Have a kn air filter
Old 11-10-2010, 06:48 PM
  #29  
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30K Miles. Blew a head gasket. Use Full Synthetic 5-20W. The Dealer said the head had a burr that caused the issue. After resurfacing the head all has been good.

Last edited by porters; 11-11-2010 at 07:00 AM.
Old 11-10-2010, 07:27 PM
  #30  
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46k miles in 18 months
2009 Rubi unlmt

Half was royal purple, half the cheap stuff.

Changed every 5k miles.
Zero engine issues

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