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Old 08-24-2014, 08:29 PM   #1
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Hot oil

Should I be concerned that occasionally when I am off road rock crawling or not moving fast the "hot oil"? I've been just opening the hood and letting it cool down, which seems to work for awhile.

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Old 08-24-2014, 08:44 PM   #2
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Fan working CONSISTENTLY? Shroud in good condition? Auto or Manual?
Radiator & Cooling system flushed recently? Tranny fluid at good level? Hood louver to keep heat down?

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Old 08-24-2014, 08:48 PM   #3
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The engine oil removes heat from the engine, the engine coolant removes heat from the oil, and the air flow through the radiator removes heat from the engine coolant.

Lifting the hood is more of a 'feel good' gesture for your mind.

Turning on the heater on full blast and leaving it on will remove far more heat from the coolant than lifting a hood will.
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Old 08-24-2014, 09:02 PM   #4
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Should I be concerned that occasionally when I am off road rock crawling or not moving fast the "hot oil"? I've been just opening the hood and letting it cool down, which seems to work for awhile.
Yes , what year jeep and are you in 4hi or 4lo
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Old 08-24-2014, 09:08 PM   #5
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It's an 08, automatic. I was in 4hi at the time, but mostly 2hi.
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Old 08-24-2014, 09:29 PM   #6
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Originally Posted by 2five22 View Post
The engine oil removes heat from the engine, the engine coolant removes heat from the oil, and the air flow through the radiator removes heat from the engine coolant.

Lifting the hood is more of a 'feel good' gesture for your mind.

Turning on the heater on full blast and leaving it on will remove far more heat from the coolant than lifting a hood will.
Hmmmm, I think it's actually a message that illuminates on the gauge cluster/ instrument panel and pertains to automatic transmission fluid temperature.

https://www.google.com/?gws_rd=ssl#q...+jeep+wrangler+
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Old 08-24-2014, 09:38 PM   #7
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It's an 08, automatic. I was in 4hi at the time, but mostly 2hi.
Get a aux trans cooler and always try to wheel in 4lo

The cooler will help when you are in 4hi and 2wd and wheeling in 4lo takes a lot of strain off your tranny
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Old 08-24-2014, 10:56 PM   #8
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Get a aux trans cooler and always try to wheel in 4lo The cooler will help when you are in 4hi and 2wd and wheeling in 4lo takes a lot of strain off your tranny
X2. ^^^^

Heat under the hood is heat. Everything is connected, directly or indirectly, vent as much heat as you can and stay in 4LO as much as possible.
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Old 08-25-2014, 07:21 AM   #9
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Your 08 auto with A/C, the transmission cooler is run through the bottom portion of the A/C condensor in front of the radiator which is not sufficient to cool your trans. fluid for heavy off road use. It's been a problem up until 2011 for autos. The hot oil light is for your trans. fluid so in your situation you should upgrade to an auxiliary transmission cooler. Chrysler finally did that with the 12 auto JK's and up. B&M is a good choice.
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Old 08-25-2014, 10:03 AM   #10
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Your 08 auto with A/C, the transmission cooler is run through the bottom portion of the A/C condensor in front of the radiator which is not sufficient to cool your trans. fluid for heavy off road use. It's been a problem up until 2011 for autos. The hot oil light is for your trans. fluid so in your situation you should upgrade to an auxiliary transmission cooler. Chrysler finally did that with the 12 auto JK's and up. B&M is a good choice.
My wife bought a new 08 JKUR auto. There was a TSB on this and it went to the dealer. They set the computer, as I recall, so that a hot oil light would come on. You were told to pull over and let it cool down. That was their fix. Within a week it had a B&M cooler installed.
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Old 08-25-2014, 10:54 AM   #11
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My wife bought a new 08 JKUR auto. There was a TSB on this and it went to the dealer. They set the computer, as I recall, so that a hot oil light would come on. You were told to pull over and let it cool down. That was their fix. Within a week it had a B&M cooler installed.
Your fix is the correct one on pre 12's.
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Old 08-25-2014, 01:16 PM   #12
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Install a trans cooler and take it out of drive when going slow. Keep it in 1st or 2nd so it doesn't shift into 3rd/4th and overheat.

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