I've been doing some research on how and what fluids to use on tranny and rear diff.

so far i understand, front diff and tranny shares fluids, center is sealed so dont bother and rear fluid uses KO305Y0900, factory fluid. http://www.subaruparts.com/catalog/?section=366

i hear mixed opinions on what fluids to be used and i read that front and rear can use the same fluid so i just wanted to make sure, is it true?

can KO305Y0900 be used for tranny/diff in front and for back?
and i hear 4.6 quarts for front and .8 for rear...this true too?

please, i did my searching so no "search first" comments :x

 

when it comes to change tranny fluid and rear diff...i always change it with redline 75W-90NS (4bottles) and 75W-90 regular (1 bottle)....

 

i hear that wrx and sti uses different fluid(for tranny), so some thats used for wrx wont work properly on sti. would this be ok for sti too?

 

mm..i am pretty sure they're the same....but call any shops to just make sure

 

i too am about to do a fluid flush and was wondering has anyone used the eneos oil? and if i get 6quarts of 75-90 is that more then enough?

 

i got oem lsd fluid for the rear and redline 75w90ns for tranny, hope this works out.

 

For whatever this is worth. I know my WRX is no Porsche, but I use Swepco Transmission Fluid. Had LIC put it in during some routine maintainance!

 

I had the Swepco from LIC put in mine also and it really works nice (once it's warm)..my WRX shifts a lot more smoothly now.

 

just like the other guys, i got some Swepco fluid.

honestly, i'm impressed so far. all the nasty notchy shifting is nearly gone. my 4th->5th gear grind is gone. and shifting, overall, is much smoother. i'm a happy camper!