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Old 02-09-2014, 12:17 AM
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Transmission & Oil Temperatures

I have a 2014 Jeep Grand Cherokee Overland, and I am trying to gauge what 'normal' and 'high' transmission and oil temperatures might be, so I know how to interpret what is being displayed on the EVIC. Can anyone help?
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Old 02-09-2014, 12:19 AM
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Re: Transmission & Oil Temperatures

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Originally Posted by Wayne in Canberra View Post
I have a 2014 Jeep Grand Cherokee Overland, and I am trying to gauge what 'normal' and 'high' transmission and oil temperatures might be, so I know how to interpret what is being displayed on the EVIC. Can anyone help?
i believe most transmissions are best at 170-185F
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Old 02-09-2014, 12:25 AM
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Re: Transmission & Oil Temperatures

Thanks Josh. Much appreciated. Is this for both transmission and engine oil? And what would you deem to be a 'high' temperature I should worry about?
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Old 02-09-2014, 09:27 AM
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Re: Transmission & Oil Temperatures

Transmission is designed to operate at 174F and the engine oil temp between 190-210F.
The Ram actually has a transmission heater to make sure the trans temp stays there or above. ZF's Lifeguard 8 is a fully synthetic ATF...
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Old 02-09-2014, 09:59 AM
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Most of the 8-speed transmissions here are typically running at 195-205 (average) when fully warmed up (which takes a while from starting to drive). Although a previous poster indicated that it's "at its best" around 174 or so, when fully hot they're going to sit around the 195-205 range in the EVIC. I've seen mine as high as 215 in stop-and-go traffic but generally 195 seems to be it's settling point.
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Old 02-09-2014, 04:43 PM
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Re: Transmission & Oil Temperatures

Yesterday towing a 2000kg trailer mine reached a high of 96C 205F have not seen it over 91C 195F without the trailer.

And it is summer conditions HOT 98F 37C yesterday.
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Old 02-09-2014, 05:12 PM
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Re: Transmission & Oil Temperatures

I think they fully expect this trans to run at those temps and the ATF is good to a pretty high temp
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Old 02-10-2014, 01:10 AM
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Re: Transmission & Oil Temperatures

While towing my 6600 lb trailer my transmission runs at 195-205. My engine oil temp has run as high as 257 while towing the trailer up a 12 mile long 6% grade at 50 mph with an OAT of 60F. There has been a lot of discussion on this forum about what is a "normal" operating temp range for this engine. Chrysler remains mum on the subject, various diesel mechanics have differing opinions, and of course, forum opinions run the gamut. I've asked a Chrysler mechanic who is currently attending tech training on the VM 3.0 to see if he can learn what "normal" oil temp is for the VM 3.0. This is a real issue for those of us that tow heavy loads. The manual is vague on the subject. It just shouldn't be this hard...
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Old 02-10-2014, 01:59 AM
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Re: Transmission & Oil Temperatures

Many thanks to everyone who has responded. Having started with absolutely no idea what numbers I should be looking for, I now have a good range of numbers to play with. I will monitor my EVIC for both transmission and engine oil temps under various 'normal' conditions. Then monitor with the caravan hooked up, also under various conditions. I'll also make sure the transmission is using the ZF Lifeguard 8 fluid recommended. Thank you so much everyone.
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Old 02-10-2014, 03:07 AM
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Re: Transmission & Oil Temperatures

Some metric measures for both oil and trans as follows taken recently on a few long trips etc

Normal summer driving I.E 25 to 35c oil around 97-99c @ 110km Highway speeds and trans around 90-91c

Hauling up Barrington Tops Mountain last week oil 114c and trans 95c, Jeep performed outrageously, handled the dirt rutted, corrugated and potholed roads effortlessly, thank goodness for full synthetic oils.
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Old 02-10-2014, 03:19 AM
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Re: Transmission & Oil Temperatures

Quote:
Originally Posted by AussieJeep View Post
Some metric measures for both oil and trans as follows taken recently on a few long trips etc

Normal summer driving I.E 25 to 35c oil around 97-99c @ 110km Highway speeds and trans around 90-91c

Hauling up Barrington Tops Mountain last week oil 114c and trans 95c, Jeep performed outrageously, handled the dirt rutted, corrugated and potholed roads effortlessly, thank goodness for full synthetic oils.
Thanks buddy. Much appreciated. Lots of data to work now.
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Old 02-11-2014, 08:52 PM
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Re: Transmission & Oil Temperatures

[QUOTE=talltale;973289]While towing my 6600 lb trailer my transmission runs at 195-205. My engine oil temp has run as high as 257 while towing the trailer up a 12 mile long 6% grade at 50 mph with an OAT of 60F.

FYI
Mobil1 ESP 5w30 engine oil (which meets Chrysler MS-11106) has a flash Point of 254C which equates to 490F. The ASTM D4683-13 test HTHS (High Temp, High Shear rate) requires a MINIMUM temp of 150C (302F). This is the usual requirement for equipment manufacturers, so running oil temps of 257F with synthetic oils is not a problem !
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