Tranny Oil advise on STi 6MT - Page 7

Rev · 02-22-2006, 01:04 PM

Quote:

Originally Posted by solbergfan

I don't think Royal Purple makes LSD oil, so you put the wrong stuff in the rear diff. You need Subaru LSD oil or Motul 90PA LSD oil (I think Silkolene makes some also). It doesn't surprise me that the dealer doesn't know what to use. They are clueless when it comes to the STi.

I think I know the reason why dealers are clueless.

Not many people have high mileage STis you know, so the number of people going for a tranny oil change/differential oil change is very low.

And, given that the LSD gear oil in the STi rear diff is different than the WRX, ignorance ensues. Or should I say, lack of experience.

rudy_t2004 · 02-22-2006, 01:36 PM

I used Silkolene that I got from Subaru of Dallas and my gear go in like butter. In addition it is a good idea to change out the rear differential as well.

Rudy

whitson01 · 02-24-2006, 05:13 AM

just to let you guys know..
i had very bad problems with my rear diff poping and binding after switching to redline.. it was really annoying.. it happened every now and then, not all the time.. anyways i switched to the jdm rear diff fluid and valveoline and its as smooth as butta'..

***sciolist*** · 02-24-2006, 02:32 PM

Quote:

Originally Posted by Rev

And, given that the LSD gear oil in the STi rear diff is different than the WRX, ignorance ensues. Or should I say, lack of experience.

Where has anything been published to differentiate between WRX and STi rear differential oil? My owner's manual makes no distinction. Subaru's branded rear differential oil makes no distinction... unless it's in the Japanese portion of the text.

Where did you get this information?

Brahmzy · 02-25-2006, 10:20 PM

The dealer I went to today in Boulder has NEVER seen nor heard of this LSD fluid...the part # is not even in their computer. I asked them..."What do you replace the STi's rear diff fluid with?" and I got...."Uh, I don't really know."

He did show me a 5-gallon barrel of the JDM 75W/90 tranny fluid they use in all of the cars...it had Subaru & Japanese writing all over it..definitely not USDM Valvoline.

So, I put Valvoline dino 75W/90 in my Legacy GT's rear diff and Redline 75W/90NS in the tranny and it feels absolutely amazing - huge difference in smoothness and shifting.

Why can't I use the Redline NS stuff in my STi transmission (NOT the R diff, just the tranny)? Some people say it works great and others say they've had grinding issues. I really want to give it a shot but don't want to waste $ and risk breaking a synchro...

Anybody else running Redline NS?

Rev · 02-25-2006, 10:53 PM

Quote:

Originally Posted by sciolist

Where has anything been published to differentiate between WRX and STi rear differential oil? My owner's manual makes no distinction. Subaru's branded rear differential oil makes no distinction... unless it's in the Japanese portion of the text.

Where did you get this information?

From the 04 STI service manual. It does make a distinction

All other models, means WRX, RS. for the STi it's different

For some sections, it does differentiate (gear oil capacity for example).

Brahmzy · 02-26-2006, 02:59 PM

^^Very nice find^^

So anybody else use Redline 75W/90NS in their STi tranny? I really want to switch after the huge difference it made in the LGT.

***sciolist*** · 02-26-2006, 03:20 PM

Quote:

Originally Posted by Rev

From the 04 STI service manual. It does make a distinction

All other models, means WRX, RS. for the STi it's different

For some sections, it does differentiate (gear oil capacity for example).

Okay, thanks. I don't know why they don't put that in the owner's manual. Seems like a more logical place. I guess I've got an extra liter of oil for the STi.

Rootus · 02-26-2006, 06:30 PM

Quote:

Originally Posted by sciolist

Okay, thanks. I don't know why they don't put that in the owner's manual. Seems like a more logical place. I guess I've got an extra liter of oil for the STi.

My manual specifies 75/90, 80, 85, and 90 as options for the WRX, depending on temperature, but only lists 90 for the STI.

Dave

chrisfx811 · 02-27-2006, 05:11 AM

Didn't read the whole thread, but here's been my gear oil odyssey.
I changed my rear diff @ 10k, and it needed it. Looked like bad coffee.
I figured I'd go ahead and do the tranny fluid too, even though it was too early.
It didn't need it. The OEM stuff was clear and stinky just like new.

From there I went through at a few changes...
Valvoline semi synth: produced a 5th gear grind
Syncromesh: 5th gear grind
Sta-lube synth: grind
M1: grind
Valvoline dino: grind

Then, on a tuning trip to SOG, I asked thm what they used for the tranny, and they had this OEM subaru stuff in black & white 5 gallon containers with Japanse writing on it.
Well, wouldn't you frikken know it, after a quick period of circulation all my grinds were GONE!
So, after many hours spent draining, flushing, and filling different oils tring to 'outdo' the Subaru engineers, I ended up right back where I started and am happier for it.

Some local dealers told me they used Valvoline, Mobil 1 synthetic, generic 75w90, etc.
I steer clear of them. Find the real deal stuff if you can.

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02-22-2006, 01:36 PM	#62
rudy_t2004 Junior STI Driver Feedback Score: 0 reviews Car: 2006 Dodge Cummins Fav Mod: CHIPPIN THE Diesel Location: San Antonio Posts: 99 IWSTI Addict since: Jul 2005	I used Silkolene that I got from Subaru of Dallas and my gear go in like butter. In addition it is a good idea to change out the rear differential as well. Rudy

02-24-2006, 05:13 AM	#63
whitson01 Spec C Club Feedback Score: 3 reviews Car: 06 acura tsx Fav Mod: soon to come Location: east TN Posts: 1,418 IWSTI Addict since: Dec 2004	just to let you guys know.. i had very bad problems with my rear diff poping and binding after switching to redline.. it was really annoying.. it happened every now and then, not all the time.. anyways i switched to the jdm rear diff fluid and valveoline and its as smooth as butta'..

02-25-2006, 10:20 PM	#65
Brahmzy Spec C Club Feedback Score: 0 reviews Location: C/S,CO Posts: 1,158 IWSTI Addict since: Dec 2004	The dealer I went to today in Boulder has NEVER seen nor heard of this LSD fluid...the part # is not even in their computer. I asked them..."What do you replace the STi's rear diff fluid with?" and I got...."Uh, I don't really know." He did show me a 5-gallon barrel of the JDM 75W/90 tranny fluid they use in all of the cars...it had Subaru & Japanese writing all over it..definitely not USDM Valvoline. So, I put Valvoline dino 75W/90 in my Legacy GT's rear diff and Redline 75W/90NS in the tranny and it feels absolutely amazing - huge difference in smoothness and shifting. Why can't I use the Redline NS stuff in my STi transmission (NOT the R diff, just the tranny)? Some people say it works great and others say they've had grinding issues. I really want to give it a shot but don't want to waste $ and risk breaking a synchro... Anybody else running Redline NS?

02-26-2006, 02:59 PM	#67
Brahmzy Spec C Club Feedback Score: 0 reviews Location: C/S,CO Posts: 1,158 IWSTI Addict since: Dec 2004	^^Very nice find^^ So anybody else use Redline 75W/90NS in their STi tranny? I really want to switch after the huge difference it made in the LGT.

02-27-2006, 05:11 AM	#70
chrisfx811 The Next Petter Solberg Feedback Score: 0 reviews Location: louisville, ky Posts: 957 IWSTI Addict since: Sep 2003	Didn't read the whole thread, but here's been my gear oil odyssey. I changed my rear diff @ 10k, and it needed it. Looked like bad coffee. I figured I'd go ahead and do the tranny fluid too, even though it was too early. It didn't need it. The OEM stuff was clear and stinky just like new. From there I went through at a few changes... Valvoline semi synth: produced a 5th gear grind Syncromesh: 5th gear grind Sta-lube synth: grind M1: grind Valvoline dino: grind Then, on a tuning trip to SOG, I asked thm what they used for the tranny, and they had this OEM subaru stuff in black & white 5 gallon containers with Japanse writing on it. Well, wouldn't you frikken know it, after a quick period of circulation all my grinds were GONE! So, after many hours spent draining, flushing, and filling different oils tring to 'outdo' the Subaru engineers, I ended up right back where I started and am happier for it. Some local dealers told me they used Valvoline, Mobil 1 synthetic, generic 75w90, etc. I steer clear of them. Find the real deal stuff if you can.