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      10-27-2012, 01:31 PM   #1
TheTal0n
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Rear differential fluid(noob question)

I searched! Im at 67k miles, I was going to put redline 75w-90, but some people said Redline 75w-90ns is the one i need, is there really a difference?
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      10-27-2012, 03:11 PM   #2
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What does Redline's vehicle application tool say to use?
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      10-27-2012, 05:03 PM   #3
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yeah i would go with 75 90ns the ns doesnt have any limited slip additives. If you have a clutch lsd then go with the non ns formula



Quote:
Originally Posted by TheTal0n View Post
I searched! Im at 67k miles, I was going to put redline 75w-90, but some people said Redline 75w-90ns is the one i need, is there really a difference?
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      03-02-2013, 11:19 PM   #4
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Quote:
Originally Posted by AlanAZ View Post
What does Redline's vehicle application tool say to use?
Sorry to bump this thread, but I have the same question and it appears that Redline still hasn't updated their website to show the 75w-90ns version of this fluid, so therefore the application tool doesn't take this into account when entering in the appropriate information. Not sure if this would be recommended over the standard 75w-90 version or not.

Thanks!
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      03-03-2013, 01:00 AM   #5
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The NS version is for limited slip diffs, if you have the standard diff, use the standard fluid.

Personally, I would use Redline 75W90 mixed with Liqui Moly 1040 additive
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      03-05-2013, 04:35 PM   #6
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Originally Posted by BillionPa View Post
The NS version is for limited slip diffs, if you have the standard diff, use the standard fluid.
Are you sure about that? Doesn't NS stand for non-limited slip?

Regular
http://www.amazon.com/Red-Line-57904...ype=automotive

NS
http://www.amazon.com/Red-Line-58304...=redline+75w90
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      03-06-2013, 04:14 AM   #7
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Quote:
Originally Posted by FCobra94 View Post
Are you sure about that? Doesn't NS stand for non-limited slip?

Regular
http://www.amazon.com/Red-Line-57904...ype=automotive

NS
http://www.amazon.com/Red-Line-58304...=redline+75w90
No, NS stands for "no slipperiness additives"

The regular oil is the NS oil PLUS the slipperiness additives (moly dithiocarbamate, etc), which do not let clutch type LSDs work properly, because the clutch plates will not lockup.

Since we have a regular diff, we want MORE slipperiness, not less, so NS is definately not the way to go.

More slipperiness = lower temps and less wear in a standard diff
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      03-06-2013, 11:14 AM   #8
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^^ Im pretty sure that is right, few years back i swapped all my fluids and remember needing only 1 quart of NS for my rear diff which is a limited slip differential.

used regular 75w-90 for my manual transmission
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      03-06-2013, 11:15 AM   #9
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Makes sense, thanks!
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      03-06-2013, 08:27 PM   #10
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Google Mike Miller's Old School BMW Maintenance Schedule. He explains the difference between the two fluids quite well. I was going to copy and paste that section but since it is copyrighted I won't.

In short he says if you have a limited slip diff you need to use 75W-90. If you have a open diff you can use either 75W-90 or 75W-90NS.
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      03-06-2013, 10:31 PM   #11
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Quote:
Originally Posted by triger716 View Post
Google Mike Miller's Old School BMW Maintenance Schedule. He explains the difference between the two fluids quite well. I was going to copy and paste that section but since it is copyrighted I won't.

In short he says if you have a limited slip diff you need to use 75W-90. If you have a open diff you can use either 75W-90 or 75W-90NS.
He makes a technical mistake there, and there are other small mistakes in that document, I saw at least one labeling Redline motor oil base stock chemistry as PAO.

Using the NS fluid in a standard diff will increase wear, as the lack of friction modifier means... higher friction.

The regular fluid is the same as the NS fluid, but it has this friction modifier added. A certain amount is needed so the clutch plates can slip during engagement, or you get chatter. The regular fluid already has an acceptable amount for most on-road LSDs that are clutch based (note, Quaife LSDs are not clutch based)

If you get excessive LSD slip with the standard fluid, you use the NS fluid and add the friction modifier until the chattering/slip balance required has been achieved, or mix a balance of standard and NS fluid together.

In a standard diff, you want as much slipperiness additive as possible without affecting the hydrodynamic lubrication of the oil. You can add a bit more of the LSD friction modifier, or use a specific hypoid gear friction additive like the LiquiMoly 1040 to improve the non-hydrodynamic properties of the oil.

In regards to using the standard 75w90 fluid in a transmission, the friction modifiers may cause synchro problems. Once again, mixing a balance of the standard and NS fluid would be best for a synchro transmission if you want GL5 protection. Most of the manual transmissions on BMW are fine with GL4, as 75W90 GL5 is considerably thicker when both warm and cold, and will reduce power to the wheels and fuel econ..... but it will protect the gearing better. The make a shockproof gear oil for racing transmissions that is the same viscosity as a GL4 fluid but provides GL5 wear protection.
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