a friend sold me 9 qts of RedLine 75w90 synthetic gear oil for $6/qt. He had no need for it.
Got a deal on RedLine 75w90
- Thread starter jetman
- Start date
Cool deal, but the NS version is kinda limited in its applications. If you’ve got something that requires that kind of fluid, awesome for you. Just be sure that you’re not blindly using that in something that requires “regular” 75w90.
What would the NS version be deficient at vs regular?
Since I’m a nice guy, I went to the Redline website for you. NS is intended for specific-application transaxles that require GL5, not differentials. See below:
Attachments
So it lacks additives for a limited slip rear end?
If it meets GL-5 it should be useable? if not the best product for the application.
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I’m not employed by Redline, nor am I an oil blender like MolaKule, Foxtrot08, or High Performance Lubricants. I gave you info directly from the source, and Redline clearly states there are differences, along with specific recommendations for do’s and don’ts for each fluid.
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Isn't subaru MT one of its applications?
The NS version, yes. Along with Porsche & Ferrari.
The “normal” 75w90 is suitable for differentials as noted above in Redline’s sales descriptions.
I thought this had come up in the past..
previous thread.
https://bobistheoilguy.com/forums/threads/redline-75w90-ns-in-rear-differential.287466/
nothing is wrong with using an api gl-5 gear oil in a regular differential (not limited slip)
previous thread.
https://bobistheoilguy.com/forums/threads/redline-75w90-ns-in-rear-differential.287466/
just because its not their recommended fluid aka " top choice"
nothing is wrong with using an api gl-5 gear oil in a regular differential (not limited slip)
Sorry folks, I grabbed the picture in post #1 of the inter web and didn't notice the NS. NS is not what I purchased. Below is what I purchased, and the pics below are of the 9 qts I purchased and put in my locker in my shop. $6 each 
This is a very simple issue. If you want to throw it in a diff that's limited slip just add slip additive. Problem solved!
