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Discussion Starter #1
Anyone know where the oil might be leaking from?

The dealer said there's no leak, but clearly there is. I wiped it off, and this is what came back within a week. There is no drips on the floor that i can see.
I checked the oil cooler area with a flashlight, and couldn't find any pool of oil or anything. I checked the dip stick and there is plenty of oil - if anything, it's above the lines. I tried to follow the oil but i can only trace it to the black rubber pieces.

I will take it back for them to check again, but wanted to see if anyone else is having this issue to know what to look for or ask.

it's a 2014 Sport S, 2 door, auto.
 

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Oh Boy, hope it isn't your rear main oil seal....Those are rubber inspection plugs, I had 3 rear main seals replaced in my bought new 2012 JKU. I finally traded it at 31,000 miles for my new 2016 Willys. My first leak was around 29,000. Dealer fixed 2 more times under warranty, but I just didn't have a good feeling about this issue when they kept messing with this leak..I had the second installed, went to pick it up, and oil was running out and had to rip everything apart again, transmission pulled out of engine, drive shafts, etc.. It's basically an all day job for a stupid tin plate with a rubber one piece oil seal. If they don't line it up correctly ( there's line up pins/dimples punched into the tin plate), you'll see oil drips at those rubber plugs. Pull that plug out, it actually should be dry. if you got engine oil in there, it's probably a rear main seal.This actually has been an issue over the years also. search on rear main oil seals.
 

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Discussion Starter #5
Pop up the plastic cover from the engine and check the area below the oil filter housing. If it has the oil puddle there - its 100% cracked oil cooler.



I had the same issue on my 2014, it was fixed under 100k basic powertrain warranty.


I did check in there, and there doesn't seem to be any puddle. I have brought it in once for it, and They claimed to have changed the oil cooler. It's in the AE version, which is not the latest one but cannot find any puddle around it.


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If it's not the oil cooler, check the valve covers along the back of the engine. If that's dry odds are it's the RMS leaking.
 

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Discussion Starter #7
Oh Boy, hope it isn't your rear main oil seal....Those are rubber inspection plugs, I had 3 rear main seals replaced in my bought new 2012 JKU. I finally traded it at 31,000 miles for my new 2016 Willys. My first leak was around 29,000. Dealer fixed 2 more times under warranty, but I just didn't have a good feeling about this issue when they kept messing with this leak..I had the second installed, went to pick it up, and oil was running out and had to rip everything apart again, transmission pulled out of engine, drive shafts, etc.. It's basically an all day job for a stupid tin plate with a rubber one piece oil seal. If they don't line it up correctly ( there's line up pins/dimples punched into the tin plate), you'll see oil drips at those rubber plugs. Pull that plug out, it actually should be dry. if you got engine oil in there, it's probably a rear main seal.This actually has been an issue over the years also. search on rear main oil seals.


Crap. this sounds like it may be it. I did pull the rubber plugs once to clean it, and it did seem like there was oil in there.
Thanks for the tip. I will do a search on it.


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Oh Boy, hope it isn't your rear main oil seal....Those are rubber inspection plugs, I had 3 rear main seals replaced in my bought new 2012 JKU. I finally traded it at 31,000 miles for my new 2016 Willys. My first leak was around 29,000. Dealer fixed 2 more times under warranty, but I just didn't have a good feeling about this issue when they kept messing with this leak..I had the second installed, went to pick it up, and oil was running out and had to rip everything apart again, transmission pulled out of engine, drive shafts, etc.. It's basically an all day job for a stupid tin plate with a rubber one piece oil seal. If they don't line it up correctly ( there's line up pins/dimples punched into the tin plate), you'll see oil drips at those rubber plugs. Pull that plug out, it actually should be dry. if you got engine oil in there, it's probably a rear main seal.This actually has been an issue over the years also. search on rear main oil seals.
I believe I have just joined your club.I like to crawl underneath once in white just make sure all is good. I saw oil in the same place as you. Removed the rockhard 4x4 skid plate (which was....unpleasant) and this is what found. Cleaned up the oil, drove around today and found fresh oil on the rubber plugs. I have a '15 JKUR with 44k miles. Oil level is fine. Call tomorrow to make an appointment. Yay.
 

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Discussion Starter #9
If it's not the oil cooler, check the valve covers along the back of the engine. If that's dry odds are it's the RMS leaking.


I never even consider looking at the valve covers. Will check it out. Thanks.


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I believe I have just joined your club.I like to crawl underneath once in white just make sure all is good. I saw oil in the same place as you. Removed the rockhard 4x4 skid plate (which was....unpleasant) and this is what found. Cleaned up the oil, drove around today and found fresh oil on the rubber plugs. I have a '15 JKUR with 44k miles. Oil level is fine. Call tomorrow to make an appointment. Yay.


Ha. The worst club ever. Looks like it leaked a lot based on your skid plates. Post back when you find out what it is causing the leak. I have to make an appointment too. Good luck.


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rear main seal 2016.JPG Just an fyi, here's what the rear main seal assemblies are in our JK's... you'll see the two alignment pins. if not seated in the matching side, oil can leak around the assembly rubber seal and run out the inspection holes.
 

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Took it in to dealer for inspection. They did a dye test, drove 10 miles, and found no leak. But i point out the small oil next to the two rubber plugs. I asked to double check again and also check the rear main seal for any leaks...
It's odd because clearly there is visible oil, but it is not dripping or puddling on the ground. What else could it be? excess oil? i do check the oil stick and it seems they always over fill it (it's above the lines). Can this be the cause of the small collection of oil?
 

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So - those plugs on the tranny just come out?

I want to pull mine and see what happens - hopefully it's dry. They're dry now - but don't want to create a problem pulling them out if I were to...
 

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Took it in to dealer for inspection. They did a dye test, drove 10 miles, and found no leak. But i point out the small oil next to the two rubber plugs. I asked to double check again and also check the rear main seal for any leaks...
It's odd because clearly there is visible oil, but it is not dripping or puddling on the ground. What else could it be? excess oil? i do check the oil stick and it seems they always over fill it (it's above the lines). Can this be the cause of the small collection of oil?
Hi Sitting duk,

Please keep us posted on what the dealership finds. We can always reach out on your behalf if you need additional assistance.

Kori
Jeep Social Care Specialist
 

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Took it in to dealer for inspection. They did a dye test, drove 10 miles, and found no leak. But i point out the small oil next to the two rubber plugs. I asked to double check again and also check the rear main seal for any leaks...
It's odd because clearly there is visible oil, but it is not dripping or puddling on the ground. What else could it be? excess oil? i do check the oil stick and it seems they always over fill it (it's above the lines). Can this be the cause of the small collection of oil?
Two things to keep in mind.
1. The dye added to the oil will only work if it is leaking oil. If it is leaking transmission fluid or coolant for example they're barking up the wrong tree adding dye to the oil. But that's just basic common sense, but worth noting for anyone learning about leak detection.

2. A very slow leak is going to take a lot more than 10 miles to show up. So be patient and keep an eye on it. For a few $$ you can invest in a black light for detecting leaks, and keep an eye on it yourself. Then if/when you see it you can bring it in.

Good luck.
 

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View attachment 3701281 Just an fyi, here's what the rear main seal assemblies are in our JK's... you'll see the two alignment pins. if not seated in the matching side, oil can leak around the assembly rubber seal and run out the inspection holes.
I have a 2015 JKUR and I had an oil leak from the rear main area at 4500 miles. Had to take it in for "diagnostics" and they determined it was the rear main. Took it in for repair and the mechanic that did the work decided on his own to replace the oil filter /cooler housing instead. When asked, he said that "they all leak so I did this instead because I am sure it was where it was leaking from". Well, I was not happy, the service advisor was not happy, but I told him I would take it home and drive it a bit more to see if it stopped leaking or not. It did not stop, so it went back last week for the rear seal replacement. I still have a very small amount of dampness on the area by the rubber plugs, but no drips. The plugs are wet, but I don't get oil dripping out. I am going to watch this like a hawk, but I think they may have fixed it this time.
 

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I spilled some oil when I was changing the filter. I sprayed simple green down by the filter housing and stuck the pressure washer in there at the car wash. I still get a drip down by the rubber plugs sometimes. Not sure if it's oil left over from that spill or if there's a small leak.
 

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OREDSOX, they are no more than inspection plugs, they are not a leak proof seal. It's just a rubber plug that fills a void, and actually, they can put a camera into the holes to visually inspect the area. But if you do have a rear main or assembly leak, the oil will collect around the black plugs from the inside and eventually start dripping/collecting around the plugs. If the plugs are dry now, you are good. Once/if you start seeing the areas WET, then worry. Mark, I feel for you, keep an eye on it....
 

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Yay!! Jeep is home now. Washed too! Thought I would post the service write up, which I giggled slightly. I'm suprised I didn't get charged for the starter and more labor to remove and straighten aftermarket skid plates. I was also suprised the bent up cross member did not get blamed for oil leak.
PS crossmember should arrive today.
 

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