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Old 12-21-2009, 03:46 PM   #1
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Need some clarification on diff fluid..

Hi everyone,

I have a question for you folks who are familiar with the 2006 Wrangler. According to my service manual, Jeep recommends 80W-90 gl-5 for the front and real differentials. Now I also have the Haynes manual (which I find is terribly incomplete, but that is another thread...) which says to use 75w-90 gl-5. Many folks have also recommended the later (75W) but I am unsure and I like to follow manufacturers guidelines.

This is a 2006 wrangler x that is at this time used for paved roads, very off roading takes place (that will be in some time).


One more questions, the allen bolt for the NP231 transfer case is a 10MM allen socket?


Thanks!

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Old 12-21-2009, 04:13 PM   #2
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Using either of those fluids would be fine. I'd use the 75w90 if you lived in a colder climate but otherwise, shouldn't be an issue either way.

I'll look later if no one answers on the Tcase socket.

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Old 12-21-2009, 06:57 PM   #3
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So long as it's a GL-5 or GL-6 gear lube, the exact viscosity is not that critical. In extremely cold conditions, a lower viscosity like 70W-80 is fine. 75W-90 is a good all-round viscosity for nearly any climate and something like 80W-120 or an 85W-140 is good if you tow, wheel in hotter conditions, or do some pretty extreme wheeling.
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Old 12-21-2009, 08:03 PM   #4
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Thanks for the responses...what exactly is cold?? I live in New York...
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Old 12-21-2009, 08:05 PM   #5
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Cold as in Buffalo NY or cold as in NYC? I would only categorize Buffalo NY type conditions as "extremely cold" where a lower viscosity like 70W-80 or a synthetic would be recommended.
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Old 12-21-2009, 08:09 PM   #6
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For now it will just be in NYC... Just curious... what would be the advantage of a 80w vs. a 75w? the 75w is more viscous at colder temps?
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Old 12-22-2009, 12:54 PM   #7
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Quote:
Originally Posted by ps49556n View Post
For now it will just be in NYC... Just curious... what would be the advantage of a 80w vs. a 75w? the 75w is more viscous at colder temps?
The lower the viscosity number, the thinner it is. So a 75W wouldn't be quite as thick at cold temps as 80W is but the actual viscosity difference between a 75W and 80W is very, very, small and not enough to be concerned over. And that 'W' like in 75W (where the 'W' stands for Winter) just means how thick it is when the lubricant is cold. When it is warmed up, its viscosity becomes the second number. So a 75W-90 lubricant has a 75 viscosity when it is cold but it becomes a 90 viscosity once it has warmed up from being driven a while.

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