Can you use 75w-90 synthetic gear fuild in your differentials? - JeepForum.com
 
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post #1 of 4 Old 07-16-2010, 01:18 AM Thread Starter
Peezi
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Can you use 75w-90 synthetic gear fuild in your differentials?

Quick question!

I am in the middle of changing my fluids on my 98 TJ and I noticed that I bought 75w-90 instead of the 75w-140, does this matter? Will performance be affected or should I just take it back and get the 75w-140?

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post #2 of 4 Old 07-16-2010, 01:23 AM
RogueSpear2023
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If you tow all the time I would get the 75w-140, but just normal use with the occasional towing 75w-90 will be fine, it's just a little lighter weight. I think the recommendation on JF is to run regular Dino oil on synthetic in the diffs, I believer there are some reports of synthetic causing the diffs to become much hotter driving around than regular Dino, plus Jeep recommends changing the diff fluid every 24,000 so no need to spend extra on synthetic, I change mine every summer if I don't go in the water over the diffs, if I do go in the water over the diffs they get changed when I get home.

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post #3 of 4 Old 07-16-2010, 01:29 AM Thread Starter
Peezi
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So its ok to use if I go wheeling and do a lot of mountain driving? I do not tow.
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post #4 of 4 Old 07-16-2010, 02:11 AM
BYuen
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Quote:
Originally Posted by Peezi View Post
So its ok to use if I go wheeling and do a lot of mountain driving? I do not tow.
I use 80w90 in my diffs. 75w90 would be fine too. I wouldn't worry about it. Diff gears generally aren't too picky about the weight you use. Stick with the Dino stuff. You'll be fine. The only time I would use synthetic diff oil is if I lived in an extremely cold climate or hauled a bunch of stuff all the time. But even then, you can't haul much in a TJ... 2000 lbs max

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75w-140 , 75w-90 , diff fluid , differential fluid , differential oil , gear oil , synthetic oil

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