Quote:
Originally Posted by marbles
I have found that the most critical temperature is that of the transmission. The engine typically gets warm but if the tranny gets too hot, you will need to change the fluid much more often. Once the fluid hits the critical temp, it changes.
Pulling up our 4,000 foot passes in Utah once a year is no big deal. Doing it 8-10 times a year, is another. I use my OBD II reader and the Torque app to monitor the tranny temps and worry once it hits 125 degrees. I will be changing the fluid shortly after hitting 145 degrees climbing the 10% grade of the Moki Dugway in the four corners area.
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Marbles, not sure if your posted temps are a typo, but driving on the freeway, not towing, my tranny temps run around 180 degrees on my Jeep Grand Cherokee.
Towing up long grades it's been as high as 215 degrees. Water temp close to 240 degrees. Oil temp close to 265 degrees on hard pulls.
Normally diesels tend to run hotter than gas engines. All the fluids in the Jeep are full synthetic and I have had no issues.
That said, I will cut the recommended time & mileage for fluid maintenance in half.
Oil change recommendations are 10,000 miles and I have changed it at 50% oil life remaining per the driver info display, which is normally about 4-5000 miles depending on the amount of towing.
If those numbers you posted are accurate you have nothing to worry about.
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