Diff Fluid=75w90NS or regular 75w90
03-31-2009, 10:31 PM
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Diff Fluid=75w90NS or regular 75w90
im about to perform my 30k mile service. which includes tranny and diff fluid change. trans im using Redline MTL and for the diff ( '04 GT= LSD correct?) i wanted to use Redline also, but i saw NS and regular. which one is for use in the stock LSD diff?
03-31-2009, 10:50 PM
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DIY thread. I used Red Line 75W90 in the diff 2. And yes to ( '04 GT= LSD correct?)
Last edited by rx8cited; 03-31-2009 at 10:52 PM.
03-31-2009, 11:36 PM
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04-01-2009, 12:28 AM
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For Rear diff, use 75w90. Or anything that meets GL-5 at the same weight or something higher like 75w140.
the NS one is NOT for use in LSD, NS means it does NOT contain the fiction modifiers required for Limited-Slip Differential to function.
04-01-2009, 02:49 AM
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whoops i actually have MT90 not MTL haha i read all about that MTL stuff before i switched it when i first bouhgt it last Oct. my bad. but im staying with MT90 hahaha.
04-01-2009, 01:52 PM
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The Nissan's use a viscous, but Mazda hasn't for 10+ years.
04-01-2009, 02:48 PM
#15
If you guys saw the various fluids I have run in my trans and diff you would think I was an idiot. Well, you may already think that, but.............
Anyway, all the fluids we have been told NOT to use I have used without incident.
Anyway, all the fluids we have been told NOT to use I have used without incident.
04-01-2009, 02:55 PM
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Yes, you are correct in that the Torsen (like the Viscous) is a clutchless design and regular GL-5 gear oil can be used (although I don't know if I would use a GL-4 like MT-90 in any Torsen type diff, just because of the higher percentage of gear/tooth contact).
) 
04-01-2009, 07:55 PM
#19
not as bad as a friend who put 2 quarts of atf in a old datsun during a oil change. when we changed the oil it was freaking weird looking. car ran fine though. he was a pack rat and still had the bottles in the box. finally put it together after looking.
04-01-2009, 08:02 PM
#20
NS = no slip modifiers
the only reason to run NS in a diff is if it's a clutch type and you're trying to induce more lockup, so there's no advantage/reason to use it in the RX-8 OE differential
slip modifiers can cause synchro engagement issues though, so running NS in the trans is a good idea, my preference is still Redline 75W-140NS
I have Kaaz 80W90 oil in the diff because I had it around at the time, not cheap ...
the only reason to run NS in a diff is if it's a clutch type and you're trying to induce more lockup, so there's no advantage/reason to use it in the RX-8 OE differential
slip modifiers can cause synchro engagement issues though, so running NS in the trans is a good idea, my preference is still Redline 75W-140NS
I have Kaaz 80W90 oil in the diff because I had it around at the time, not cheap ...
