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Premium Member
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10,093 Posts
I am running synthetic ATF+4 no issues
 

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Registered
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4,757 Posts
I dont think it would be an issue in south florida, but it isnt a wise thing to do for a Jeep that would run in the colder climates. Oil, doesnt matter what type, gets thicker with a drop in temperature.

They claim that synthetic doesnt do that, but it still changes the molecular structure.

30W oil would be way too thick for the pump and filter system in an NP231 once it got below 32 degrees outside.
 

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Premium Member
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3,316 Posts
I drained my fluid a few months ago and replaced with ATF +4 and it's shifted smoother in and out of 4WD since and the gear whine I was experiencing has all but gone away.
 

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4,062 Posts
The NP231 calls for ATF+4... Never heard of using oil instead except in some motorcycle transmisions.
 
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