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Unread 06-17-2013, 03:51 PM   #1
Jeffro3000
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Diff fluid question

Im going to be changing my diff fluid for the first time. My manual says 80w/90...but im seeing 75w/90 on the web....does it matter?

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Unread 06-17-2013, 04:02 PM   #2
ronjenx
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Quote:
Originally Posted by Jeffro3000 View Post
Im going to be changing my diff fluid for the first time. My manual says 80w/90...but im seeing 75w/90 on the web....does it matter?
No, it doesn't matter, as long as the one you use is API GL-5 rated.
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Unread 06-17-2013, 04:10 PM   #3
LVCapo
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I use Amsoil 75W/140 Severe Gear front and rear in my Jeeps. Make sure if you have the LSD in yours that you pi8ck up the additive from a local dealership.
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Unread 06-17-2013, 04:30 PM   #4
JIMBOX
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My manual also ref's 75w-140 (syn) for HD/towing-

I use Valvoline 75w-140 in both diffs-

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Unread 06-18-2013, 05:50 AM   #5
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I use Valvoline Durablend in front and rear. Great oil for 9bucks a qrt.
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Unread 06-18-2013, 06:32 AM   #6
Butterjeep
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I use the cheapest proper diff fluid I can find. It's a fluid I change frequently and the only benefit to pricey synthetic would be extended drain intervals.
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Unread 06-18-2013, 09:09 PM   #7
jkode87
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75 140 synthetic with the additive every 30k

Or as needed with these axle tube seal leaks.....
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Unread 06-19-2013, 06:16 AM   #8
Wavedatya
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Quote:
Originally Posted by jkode87
75 140 synthetic with the additive every 30k

Or as needed with these axle tube seal leaks.....
What he said
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Unread 06-19-2013, 09:59 AM   #9
Jeffro3000
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Thanks for the replies....but what's the real difference. The spots I wheel at can have alot of water....so I'm going to start changing it more often. So if I'm changing it a few times a year, will syth matter? I'm doing it becase my diffs are weeping, so I'm changing it and using lubelocker gaskets.
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Unread 06-19-2013, 10:11 AM   #10
LVCapo
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Quote:
Originally Posted by Jeffro3000 View Post
https://www.facebook.com/photo.php?v=4390059050166
Thanks for the replies....but what's the real difference. The spots I wheel at can have alot of water....so I'm going to start changing it more often. So if I'm changing it a few times a year, will syth matter? I'm doing it becase my diffs are weeping, so I'm changing it and using lubelocker gaskets.
I think you just kind of answered your own question

Synthetics are a great option for people operating under severe conditions, or who want to extend their fluid change schedule...if you are going to change fluid frequently, go with the cheapest quality selection possible.
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Unread 06-19-2013, 10:12 AM   #11
duneslider
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I use the synthetic mainly because it doesn't smell as bad as the dino version.
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Unread 06-19-2013, 10:23 AM   #12
Wavedatya
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I use Amsoil 75w-140 for towing purposes
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Unread 06-19-2013, 12:28 PM   #13
SubAtomicGenius
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Quote:
Originally Posted by Jeffro3000 View Post
https://www.facebook.com/photo.php?v=4390059050166
Thanks for the replies....but what's the real difference. The spots I wheel at can have alot of water....so I'm going to start changing it more often. So if I'm changing it a few times a year, will syth matter? I'm doing it becase my diffs are weeping, so I'm changing it and using lubelocker gaskets.
If you go watersporting alot, go and buy a 5-gal pail of 80w90 or 80w140 (towing) dino that meets the spec and change often. If you go synthetic, you're only wasting money every time you suck water into your diff.
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Unread 06-19-2013, 07:24 PM   #14
Butterjeep
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Quote:
Originally Posted by Butterjeep View Post
I use the cheapest proper diff fluid I can find. It's a fluid I change frequently and the only benefit to pricey synthetic would be extended drain intervals.
I'll requote myself because I think it answers your question. If you'll drain it out relatively soon, why pay a fortune for it?
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Unread 06-24-2013, 10:46 AM   #15
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Quote:
Originally Posted by duneslider View Post
I use the synthetic mainly because it doesn't smell as bad as the dino version.
I recently changed the rear diff fluid in a 47-year old Chevy with about 110k miles...I don't know if it had ever been done before, but the smell was indescribable.
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