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post #1 of 19 Old 09-02-2012, 03:08 PM Thread Starter
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Hot Oil Message

I was four wheeling in the sand, and after a short while i got a hot oil message on the dash. This is the first time i have gotten this message. I was in 4hi going around 20mph (2008 Jeep 4door Unlimited)
Is this normal?
Anyone else have this trouble?
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post #2 of 19 Old 09-02-2012, 03:09 PM
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Very normal actually, your trans is destroying itself. 4-hi, low speed and very high load [sand] is making a ton of heat. You need an auxiliary transmission cooler. asap.

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post #3 of 19 Old 09-02-2012, 03:17 PM
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Quote:
Originally Posted by Goodysgotacuda View Post
Very normal actually, your trans is destroying itself. 4-hi, low speed and very high load [sand] is making a ton of heat. You need an auxiliary transmission cooler. asap.
That, and also be in 4-lo. You don't want to cruise for extended periods in 4-hi with an auto unless you have a trans cooler.

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post #4 of 19 Old 09-02-2012, 04:15 PM
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Any one else thought the title of this thread reads "Hot Oil Massage"...

But yeah trany cooler.. I Like the PSC Dual cooler setup. Need to do this to Smurfette at some point.

http://www.pscmotorsports.com/featur...al-cooler.html

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post #5 of 19 Old 09-02-2012, 04:26 PM
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Quote:
Originally Posted by HITMONEY View Post
Any one else thought the title of this thread reads "Hot Oil Massage"...

But yeah trany cooler.. I Like the PSC Dual cooler setup. Need to do this to Smurfette at some point.

http://www.pscmotorsports.com/featur...al-cooler.html
Yea but i think this will end up with a not so happy ending
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post #6 of 19 Old 09-02-2012, 04:36 PM
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Originally Posted by HITMONEY View Post
Any one else thought the title of this thread reads "Hot Oil Massage"...
Only reason I clicked on it

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post #7 of 19 Old 09-02-2012, 04:37 PM
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Not to derail, but I have been meaning to ask this for a while,....why is it that manual tranny's never have issues with overheating (or at least with the JK's you dont hear of it happening)? Is it because of the fact that the auto has so many more moving parts that contributes to the temp increase vs the manual?

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post #8 of 19 Old 09-02-2012, 04:42 PM
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Originally Posted by rdlynch2 View Post
Not to derail, but I have been meaning to ask this for a while,....why is it that manual tranny's never have issues with overheating (or at least with the JK's you dont hear of it happening)? Is it because of the fact that the auto has so many more moving parts that contributes to the temp increase vs the manual?
Torque converter = major heat generator. When a rig is under a heavy load, say trying to crawl up the face of a rock and under-geared. The engine is turning at say 2000rpm, the wheels are being powered but the Jeep isn't moving. Well that 2000rpm and the torque generated goes somewhere, that torque converter is lit up like if a manual just sat there and just slightly slipped the clutch enough to stop movement but transfer power. The clutch has no option but to slip/generate heat and fail, but the automatic can dissipate that heat through fluid heat exchangers. Not enough surface area and air-flow through the heat exchangers and you'll overheat the fluid in a hurry.

A manual can create a good amount of heat if you slip the clutch enough, but it's dissipated through the flywheel and clutch wear.

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post #9 of 19 Old 09-02-2012, 11:15 PM
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Quote:
Originally Posted by HITMONEY View Post
Any one else thought the title of this thread reads "Hot Oil Massage"...

But yeah trany cooler.. I Like the PSC Dual cooler setup. Need to do this to Smurfette at some point.

http://www.pscmotorsports.com/featur...al-cooler.html
No, you're not

Install a cooler. I need to do the same and quit just telling people to install one.

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post #10 of 19 Old 09-02-2012, 11:34 PM
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No, you're not

Install a cooler. I need to do the same and quit just telling people to install one.
That makes two of us.

Greg
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post #11 of 19 Old 09-03-2012, 12:19 AM
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This weekend was my second off-road trip in the Rubi, and I saw this same message after a few hours of relatively easy trail running. I had it in 2wd all day, then while going up a decent sized hill (in D with O/D off) I got my first warning. I immediately pulled over and shut her down for about a half hour. Started it back up and decided to try it in 4-Hi. Message came back about 10 minutes later and almost immediately, it popped out of gear. It acted like the tranny had completely gone. Could not get forward or backward movement in any gear, 2wd or 4wd...and was waaaay out in the middle of nowhere. Let it sit for about an hour while I weighed my options. Fired her back up and everything seemed normal so I limped back to camp, then cut my trip short and headed home first thing this morning.

Having been working on cars for many years, I know that tranny problems only get worse with time, not better. Has anyone had any luck trying to get a transmission replaced that was damaged due to regular usage like this? I'm going to take it into my dealer on Tuesday, but am anticipating behind told to pound sand. Just curious to hear if anyone else had any luck with this.
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post #12 of 19 Old 09-03-2012, 05:23 AM
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2wd is almost just as hard on the trans as 4-hi. Good luck on getting the trans replaced, unless it's showing current problems, the fluid is black, they'll probably tell you to pound sand. But they can also likely see your speed, transfer case setting, etc when it lit and tell you were off-road..

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post #13 of 19 Old 09-03-2012, 06:28 AM
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I installed an aux transmission cooler, and installed a mechanical fan on the water pump pulley, with the shroud on the radiator that goes with it.
It constantly pulls air through the grill.



Here is a link to the thread. It describes some of the benefits, and drawbacks of the conversion.
https://www.jkowners.com/forum/showthread.php?t=76475

2008 Unlimited Rubicon Automatic
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post #14 of 19 Old 09-03-2012, 06:32 AM
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I never understood why some people try to wheel in any gear other than 4Low.

You should change your fluid AND filter immediately. I'd bring it to the dealer for fluid change and complain of the hot oil message, document it, and hope that when (not if) the tranny goes, it's under warranty. How old, how many miles do you have on it? What power train warranty do you have?

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post #15 of 19 Old 09-03-2012, 06:35 AM
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Quote:
Originally Posted by AdamIsAdam View Post
I never understood why some people try to wheel in any gear other than 4Low.
Any seat time at all in a manual off-road and one would know very quickly what is going on. Unfortunately the automatic eats up a bunch of slippage without really telling a driver that isn't paying attention. I know I can't do much of anything in 2wd or 4-hi without really working the clutch, 4low it is.

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post #16 of 19 Old 09-03-2012, 07:02 AM
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Quote:
Originally Posted by ChrisJ View Post
This weekend was my second off-road trip in the Rubi, and I saw this same message after a few hours of relatively easy trail running. I had it in 2wd all day, then while going up a decent sized hill (in D with O/D off) I got my first warning. I immediately pulled over and shut her down for about a half hour.
Two issues I see right there.
First no problem with doing "light" trail runs at 2/4 Hi but then manually shift the tranny down to keep the torque converter on as light a load as possible. Second the engine off when you get the hot oil message is the wrong thing to do since the heat that is already there cannot dissipate sufficiently/quickly. Per owners manual keep the engine running with the tranny in neutral when you get the Hot Oil message, that way the tranny fluid keeps circulating through the cooler lowering the temps quicker and it avoids "hot spots" in the tranny.


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post #17 of 19 Old 09-03-2012, 07:16 AM
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Quote:
Originally Posted by AdamIsAdam View Post
I never understood why some people try to wheel in any gear other than 4Low.
Some times you get caught.... I have a tranny cooler... Last night we had a Bon fire on the outer beach, party broke up about 1 am, I was in 2wd leaving the beach and one of the County employee's was sunk in deep.

Pulled out the snatch strap, thru it in 4 hi, about 20 tugs to get him up to the
Dirt road, like Goody said all that power turned to heat = hot oil light. With hind sight I should have gone down to the water line and rolled it into 4 low. Even the tranny cooler has freaking hot to the touch
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post #18 of 19 Old 09-03-2012, 06:23 PM
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Quote:
Originally Posted by Panamon Creel View Post
Two issues I see right there.
First no problem with doing "light" trail runs at 2/4 Hi but then manually shift the tranny down to keep the torque converter on as light a load as possible. Second the engine off when you get the hot oil message is the wrong thing to do since the heat that is already there cannot dissipate sufficiently/quickly. Per owners manual keep the engine running with the tranny in neutral when you get the Hot Oil message, that way the tranny fluid keeps circulating through the cooler lowering the temps quicker and it avoids "hot spots" in the tranny.
Yeah that ^^^ Put it in neutral and also raise the idle rpm's up for a bit.

Using the lower gearing also keeps the rpm's up and the trans pump running faster. Faster running trans pump = more circulation through the trans cooler as well.

But..... you really do need an auxiliary cooler.
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post #19 of 19 Old 09-03-2012, 07:00 PM
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A Cooler is needed also just keep the AC on when going up hill.


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