FX-RX8

Should I use Redline MT90 NS or non NS???? We have Limited Slip Diff so the right Oil should be NS but I was told other wise......also Do I have to change the Diff's oil too??? I only have 9000 miles on the car....Im doing the Tranny cuz I did the same with my previous 2002 WRX and it made a big improvement in shifting...no grinding of the gears, etc..

army_rx8

just put in the redline oil tha tthe tranny askes for, i believe it is gt4 or something nliek that.

there are already a lot of threads abotu tranny and diff oil..talking abotu royal purple and redline. fo rmore indepth answers check them they are very long and loaded with great info. :D

RotorGeek

The NS means for cars that do not have limited slip. This is off there site

"75W90
Our most popular gear oil, this is the preferred product in nearly all car and light truck differentials, both conventional and limited-slip. 75W90 is preferred for most racing applications. It contains friction modifier which is recommended for limited-slip units. 75W90 Gear Oil can be used in many transmissions and transaxles "

RotorGeek

You could do just the tranny if you want but you might as well do both while you have the car on Jack stands. The diff is easier to do also

army_rx8

^indeed it is. well unles you are having a shop do it..then it'll cost more.

FX-RX8

So I ordered the MT90 Red Line.....That should do it Right.

Rotario

I'm confused: you state "tranny oil change" in the subject, but then start talking about the differential. Regardless, if you are going with RedLine, use the MT-90 in the tranny, and the 75W-90 in the differential.

Best,
Bill

RotorGeek

Yeah if you just want to change the tranny.

Dark8

https://www.rx8club.com/showthread.p...light=red+line

FX-RX8

Thanx for the INFO...those pics are very helpfull.....I will change both oils.