Rear Diff Oil, 75w90 vs 75w90NS

spearfish25 · 02-11-2010, 02:17 PM

(added this as a post in my DIY thread, but figured it would be helpful as a standalone for searching later)

Does anyone know the difference between Redline 75w90 and 75w90NS? The 'regular' 75w90 is what I put in the rear diff during my last change. Reading the info online says it's not for manual transmissions due to issues with the synchros...I assume it's fine for the rear diff (and has been for me for the past 4k miles). Then there is the 75w90NS which is listed under manual transmission fluids but is GL-5 which is rear diff compatible. The description for the NS also seems to talk more about LSDs and improving locking ability.

Thoughts?

jpit · 02-11-2010, 02:32 PM

You used the right oil. The NS is for gear LSDs and not the viscous LSDs that the 370z has.

spearfish25 · 02-11-2010, 03:08 PM

Cool. Started second guessing myself, then wondering if the other was better.

02-11-2010, 02:17 PM	#1 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Rear Diff Oil, 75w90 vs 75w90NS (added this as a post in my DIY thread, but figured it would be helpful as a standalone for searching later) Does anyone know the difference between Redline 75w90 and 75w90NS? The 'regular' 75w90 is what I put in the rear diff during my last change. Reading the info online says it's not for manual transmissions due to issues with the synchros...I assume it's fine for the rear diff (and has been for me for the past 4k miles). Then there is the 75w90NS which is listed under manual transmission fluids but is GL-5 which is rear diff compatible. The description for the NS also seems to talk more about LSDs and improving locking ability. Thoughts? __________________ 2013 Cadillac V-Wagon, RIP Z Last edited by spearfish25; 02-11-2010 at 02:19 PM.

02-11-2010, 03:08 PM	#3 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Cool. Started second guessing myself, then wondering if the other was better. __________________ 2013 Cadillac V-Wagon, RIP Z

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02-11-2010, 02:32 PM	#2 (permalink)
jpit Enthusiast Member Join Date: Feb 2009 Location: Washington State Posts: 440 Drives: 370Z Tour MT w/Spt Rep Power: 16	You used the right oil. The NS is for gear LSDs and not the viscous LSDs that the 370z has.