Differential fluid - JeepForum.com
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post #1 of 23 Old 02-05-2020, 02:36 PM Thread Starter
Capital AL
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Differential fluid

I will be changing the fluid in the front and rear differential soon and wanted to know if the Mopar 75W-140 is required or if I can use any fluid that 75W-140 API-GL5. I have found a Valvoline 75W-140 API-GL5 gear oil and a Royal Purple 75W-140 API-GL5 gear oil. Would either of these gear oils be acceptable?

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post #2 of 23 Old 02-05-2020, 03:54 PM
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http://www.wkjeeps.com/wk_maintenance.htm

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post #3 of 23 Old 02-05-2020, 04:38 PM Thread Starter
Capital AL
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http://www.wkjeeps.com/wk_maintenance.htm

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Thank you for the link, I have read through that and was curios if I can use anything besides the listed Mopar oil with the same specifications.
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post #4 of 23 Old 02-05-2020, 04:50 PM
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Quote:
Originally Posted by Capital AL View Post
I will be changing the fluid in the front and rear differential soon and wanted to know if the Mopar 75W-140 is required or if I can use any fluid that 75W-140 API-GL5. I have found a Valvoline 75W-140 API-GL5 gear oil and a Royal Purple 75W-140 API-GL5 gear oil. Would either of these gear oils be acceptable?


Yes you can use any of those. You may need to add mopar friction modifier depending on the types of diff you have.
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post #5 of 23 Old 02-05-2020, 05:06 PM
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Thank you for the link, I have read through that and was curios if I can use anything besides the listed Mopar oil with the same specifications.
All I've read reveals that these things are very temperamental. Make sure whatever you use is approved by the maker. I used the Valvoline ATF, but it is approved by Chrysler.

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post #6 of 23 Old 02-05-2020, 05:06 PM
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I wouldn't use the royal purple, you can't read the condition of the fluid with that stuff.
If your front diff is leaking at the cover joint you should go through the trouble to reseal it as it's a common problem. The same goes with the rear but much easier to do. Take the vent hoses off and blow them out too.

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post #7 of 23 Old 02-05-2020, 05:20 PM
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You have standard, open differentials. Nothing strange , no friction modifier or temperamental about them . If you donít tow anything you could even run an 85w90 if you want to. Otherwise my only suggestion would be run a synthetic because thatís what it comes from factory with.

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post #8 of 23 Old 02-05-2020, 06:18 PM Thread Starter
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You have standard, open differentials. Nothing strange , no friction modifier or temperamental about them . If you don’t tow anything you could even run an 85w90 if you want to. Otherwise my only suggestion would be run a synthetic because that’s what it comes from factory with.
I do occasionally tow. After what someone mentioned about the royal purple I am questioning whether I will even do the diff oil changes. I have 65,000 miles and likely will sell the vehicle within 2-3 years. Not sure if it is even worth doing at this point.
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post #9 of 23 Old 02-05-2020, 06:42 PM
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Hi
I just bought four of these for my 2008 wk with open diffs. https://www.amsoil.com/shop/by-produ...-gear-75w-140/
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post #10 of 23 Old 02-05-2020, 06:43 PM
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Originally Posted by Capital AL View Post
I do occasionally tow. After what someone mentioned about the royal purple I am questioning whether I will even do the diff oil changes. I have 65,000 miles and likely will sell the vehicle within 2-3 years. Not sure if it is even worth doing at this point.
At 65k, on open axles, they will be due. Personally I would change it just for the piece of mind and to get under there , look for leaks and work the diff breather. I donít pull the covers unless theyíre leaking . a manual fluid extractor will allow you to see if thereís water in there . Use the cheaper stuff for sure.

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post #11 of 23 Old 02-05-2020, 06:55 PM Thread Starter
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Originally Posted by yzjwk View Post
At 65k, on open axles, they will be due. Personally I would change it just for the piece of mind and to get under there , look for leaks and work the diff breather. I donít pull the covers unless theyíre leaking . a manual fluid extractor will allow you to see if thereís water in there . Use the cheaper stuff for sure.
Thanks for the reply, I will probably go with the cheaper Valvoline. What exactly do I need to do with the diff breather and where is it located?
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post #12 of 23 Old 02-05-2020, 06:59 PM
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The front open differential is tiny, it needs fluid services or it will have problems.

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post #13 of 23 Old 02-05-2020, 07:40 PM
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Originally Posted by Capital AL View Post
Thanks for the reply, I will probably go with the cheaper Valvoline. What exactly do I need to do with the diff breather and where is it located?
Rear breather is hanging above the axle ( rt side I believe )but just follow the rubber tube. Some people take them off and wash them and make sure the 1way valve still works, but as long as it’s not greasy, I Just push in and turn the tip a few times to get it loose and get the sand out . Front breather should be on the strut tower bolts under the hood.

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post #14 of 23 Old 02-06-2020, 06:01 AM
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Cheap fluids will turn out expensive on the differentials. Go with the correct Mopar fluids.
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post #15 of 23 Old 02-06-2020, 06:43 AM
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Quote:
Originally Posted by Capital AL View Post
I do occasionally tow. After what someone mentioned about the royal purple I am questioning whether I will even do the diff oil changes. I have 65,000 miles and likely will sell the vehicle within 2-3 years. Not sure if it is even worth doing at this point.
Mobil-1 makes a synthetic 75W-140 gear lube that is good. I change the differential fluid every 60K miles (infrequent light towing) and the drained fluid looks almost new.

Takes 2 qts per axle. Remove front differential fill plug first (to be sure it is free) before you drain it. IIRC it is a 14mm Allen key with limited room to work. Socket is too long.

QTII= no friction modifier required ; QDII = 1 bottle (4 oz.) MOPAR friction modifier in each axle.

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