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Old 05-04-2005, 05:04 AM   #1
eakins
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Default Redline 75w-90 or 75w-90ns in the rear.

my car is a 00 outback with (i think) a LSD rear.
some use 75w-90 & some use 75w-90ns. which is correct?
is ther lsd rear viscous? any other better options?
thanks!
bill
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Old 05-04-2005, 08:15 AM   #2
LyveWRX
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IIRC the read LSD is viscous, I would use redline 75w-90.
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Old 05-04-2005, 05:01 PM   #3
1984
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I've got a question about Redline gear oil as well. I'm reading the label on a bottle of Redline 75w90ns and it says that the fluid should not be used in the diff of a rwd car unless friction modifier is added. Does it matter if I put this oil in the rear diff of my WRX? I've searched and haven't found a straight answer. It seems that it's okay to use Mobil 1 in the rear diff.
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Old 05-04-2005, 05:19 PM   #4
Mulder
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The WRX rear diff is a sealed viscous coupling type LSD. Since it's sealed and has no contact with the fluid, it doesn't matter what oil you use as long as it meets the spec for rating and viscosity. The instructions on the Redline bottle refer to "wet" clutch type LSDs that are not sealed and are exposed to the fluid, for those the friction modifier additives are required for them to operate correctly. Since the NS fluid doesn't contain those additives they must be added separately if it is used with a wet LSD.
The LSDs in the earlier cars may be wet, I don't know for certain. To be sure of having the proper lubrication and additives just use the 75W90 in the rear (not the NS). If there is a wet LSD the additives are required, if it's a sealed unit the additives are still beneficial unlike in the trans where they can cause problems.
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Old 05-04-2005, 05:29 PM   #5
subarurabbit
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iirc, I thought 80w90 was the spec on the rear diff.
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Old 05-04-2005, 05:36 PM   #6
Mulder
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For the newer models the spec is GL-5 75W90 for the trans and rear, with other grades also acceptable according to the chart in the manual.
Older cars, refer to your manual or the Subaru site for specs.
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