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02 subaru wrx trans and diff fluid recommendations #4575818
11/16/17 09:51 AM
11/16/17 09:51 AM
Joined: Mar 2015
Posts: 339
New York
02s4audi Offline OP
02s4audi  Offline OP
Joined: Mar 2015
Posts: 339
New York
I have a 2002 subaru wrx. I want to change out the differential fluid and transmission fluid because I don't know when they were last changed. From what I've seen it seems that amsoil severe is among ine of the best and i can get that locally. My questions is they offer 75w90 and 75w110. Which would be better for the trans and diff? Would one weight be better for one and another weight for the other? The car is currently about 300whp, it is a daily driver and doesn't see track use but does get spirited driving.

Re: 02 subaru wrx trans and diff fluid recommendations [Re: 02s4audi] #4575855
11/16/17 10:22 AM
11/16/17 10:22 AM
Joined: Mar 2013
Posts: 4,873
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 4,873
The Midwest
I owned an 07' WRX once. I don't recommend the Uncle Scotty cocktail. The transmission is fragile and the best oil on Earth won't make up that the transmission was originally designed for 75 HP. Budget for a new transmission when it explodes.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Re: 02 subaru wrx trans and diff fluid recommendations [Re: 02s4audi] #4575881
11/16/17 10:48 AM
11/16/17 10:48 AM
Joined: Mar 2015
Posts: 339
New York
02s4audi Offline OP
02s4audi  Offline OP
Joined: Mar 2015
Posts: 339
New York
I'm not expecting it to help the trans in relation to exploding. Just want to change the fluid as I'm not sure it's ever been done and I like to keep my cars maintained.

Re: 02 subaru wrx trans and diff fluid recommendations [Re: 02s4audi] #4575922
11/16/17 11:33 AM
11/16/17 11:33 AM
Joined: May 2012
Posts: 1,616
The land of USA-made Subies!
SubieRubyRoo Online content
SubieRubyRoo  Online Content
Joined: May 2012
Posts: 1,616
The land of USA-made Subies!
SVG is a great fluid. Motul Gear 300 is another stellar fluid. Stay away from cocktails. Change every 30k and don't beat the sheet out of it by dropping the clutch at redline or speedshifting with your gas foot on the floor.

Drive the car for 15-20 minutes to get the fluid warm and circulated, then drain it. Enjoy!

Re: 02 subaru wrx trans and diff fluid recommendations [Re: 02s4audi] #4575927
11/16/17 11:37 AM
11/16/17 11:37 AM
Joined: Sep 2015
Posts: 2,345
Malaysia
zeng Online content
zeng  Online Content
Joined: Sep 2015
Posts: 2,345
Malaysia
I would pick 75W110 for its higher [email protected]*C .

Re: 02 subaru wrx trans and diff fluid recommendations [Re: SubieRubyRoo] #4575934
11/16/17 11:45 AM
11/16/17 11:45 AM
Joined: Mar 2015
Posts: 339
New York
02s4audi Offline OP
02s4audi  Offline OP
Joined: Mar 2015
Posts: 339
New York
Trust me the car definitely doesn't get launched or anything like that proper warm up and cool down. Spirited driving at most and that's just a quick pull on 3rd or so. I'm trying to pro long it's reliability. I guess no one around has amsoil like I thought. What else would you guys recommend for off the shelf fluid?

Re: 02 subaru wrx trans and diff fluid recommendations [Re: 02s4audi] #4575935
11/16/17 11:45 AM
11/16/17 11:45 AM
Joined: Mar 2015
Posts: 339
New York
02s4audi Offline OP
02s4audi  Offline OP
Joined: Mar 2015
Posts: 339
New York
Also I'm located in NY if that makes a difference

Re: 02 subaru wrx trans and diff fluid recommendations [Re: 02s4audi] #4576095
11/16/17 02:30 PM
11/16/17 02:30 PM
Joined: May 2009
Posts: 12,255
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline
Joined: May 2009
Posts: 12,255
N.H, U.S.A.
why not 80W90 HD dino In the rear diff if the service manual lists 80w-Xx. Most of hypoid magic is in the the additives not the oil. I hear Naphthenic does fine in non-combustion places

Last edited by ARCOgraphite; 11/16/17 02:32 PM.

2014 Nissan Rogue S CVT, OC#9 41392mi-QSUD10W30 + M110A CHAMP Filter; 2017 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter
Re: 02 subaru wrx trans and diff fluid recommendations [Re: 02s4audi] #4576119
11/16/17 02:54 PM
11/16/17 02:54 PM
Joined: Mar 2017
Posts: 29
Brazoria County Texas
rotorcraft230 Offline
rotorcraft230  Offline
Joined: Mar 2017
Posts: 29
Brazoria County Texas
Originally Posted By: 02s4audi
I have a 2002 subaru wrx. I want to change out the differential fluid and transmission fluid because I don't know when they were last changed. From what I've seen it seems that amsoil severe is among ine of the best and i can get that locally. My questions is they offer 75w90 and 75w110. Which would be better for the trans and diff? Would one weight be better for one and another weight for the other? The car is currently about 300whp, it is a daily driver and doesn't see track use but does get spirited driving.


I have a 2014 Subaru WRX and changed my fluid at 12500 to the Amsoil long life 75W-90 in both the transmission and the rear differential. its been 8000 miles and the car shifts smoother than the OEM stuff I drained out. I would recommend the Amsoil Severe Gear or the Long Life Gear oil.


06 Silverado 237,000 Val HM 5W-30 DD
14 WRX Hatch Rotella T6 5W-40
11 Subaru Outback Wife Val HM 5W-30
13 Honda Civic Daughter Val 0W-20
Re: 02 subaru wrx trans and diff fluid recommendations [Re: 02s4audi] #4576230
11/16/17 04:42 PM
11/16/17 04:42 PM
Joined: Mar 2013
Posts: 4,873
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 4,873
The Midwest


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Re: 02 subaru wrx trans and diff fluid recommendations [Re: 02s4audi] #4576342
11/16/17 06:20 PM
11/16/17 06:20 PM
Joined: Mar 2015
Posts: 339
New York
02s4audi Offline OP
02s4audi  Offline OP
Joined: Mar 2015
Posts: 339
New York
At this point a new transmission isn't in order. I'm aware of how weak it is. I was simply asking what fluid would be good for it.

Re: 02 subaru wrx trans and diff fluid recommendations [Re: 02s4audi] #4576424
11/16/17 08:03 PM
11/16/17 08:03 PM
Joined: Oct 2002
Posts: 47,284
Duvall WA - Pacific NW USA
Pablo Offline
Pablo  Offline
Joined: Oct 2002
Posts: 47,284
Duvall WA - Pacific NW USA
Originally Posted By: 02s4audi
I have a 2002 subaru wrx. I want to change out the differential fluid and transmission fluid because I don't know when they were last changed. From what I've seen it seems that amsoil severe is among ine of the best and i can get that locally. My questions is they offer 75w90 and 75w110. Which would be better for the trans and diff? Would one weight be better for one and another weight for the other? The car is currently about 300whp, it is a daily driver and doesn't see track use but does get spirited driving.


This: Amsoil SVT 75W-110

I have 30K+ miles on the fluid in mine and it shifts perfectly, just like the day I filled it. Odd that the guys (some guy old scotty or soemthing) at NASIOC said it would degrade rapidly. Not the case at all. Put the same fluid in the rear diff.


DIRECT JOBBER - PABLO - for all your Amsoil needs
http://oilslubesandfilters.shopamsoil.com/


Re: 02 subaru wrx trans and diff fluid recommendations [Re: Pablo] #4576792
11/17/17 08:57 AM
11/17/17 08:57 AM
Joined: Sep 2015
Posts: 2,345
Malaysia
zeng Online content
zeng  Online Content
Joined: Sep 2015
Posts: 2,345
Malaysia
Originally Posted By: Pablo
Originally Posted By: 02s4audi
I have a 2002 subaru wrx. I want to change out the differential fluid and transmission fluid because I don't know when they were last changed. From what I've seen it seems that amsoil severe is among ine of the best and i can get that locally. My questions is they offer 75w90 and 75w110. Which would be better for the trans and diff? Would one weight be better for one and another weight for the other? The car is currently about 300whp, it is a daily driver and doesn't see track use but does get spirited driving.


This: Amsoil SVT 75W-110

I have 30K+ miles on the fluid in mine and it shifts perfectly, just like the day I filled it. Odd that the guys (some guy old scotty or soemthing) at NASIOC said it would degrade rapidly. Not the case at all. Put the same fluid in the rear diff.

This.

Re: 02 subaru wrx trans and diff fluid recommendations [Re: 02s4audi] #4577022
11/17/17 12:19 PM
11/17/17 12:19 PM
Joined: May 2009
Posts: 12,255
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline
Joined: May 2009
Posts: 12,255
N.H, U.S.A.
The only tough trans I had (in over 70 cars) in a high torque high HP engine was a muncie m21 4 speed. Most 200+ hp engines will eat transmissions if you drive them like a banshee; BTDT smile

Subaru is known for having excellent manual transmissions for NA applications.


2014 Nissan Rogue S CVT, OC#9 41392mi-QSUD10W30 + M110A CHAMP Filter; 2017 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter
Re: 02 subaru wrx trans and diff fluid recommendations [Re: Pablo] #4578026
11/18/17 02:08 PM
11/18/17 02:08 PM
Joined: Jan 2009
Posts: 6,332
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,332
New England
Originally Posted By: Pablo
Originally Posted By: 02s4audi
I have a 2002 subaru wrx. I want to change out the differential fluid and transmission fluid because I don't know when they were last changed. From what I've seen it seems that amsoil severe is among ine of the best and i can get that locally. My questions is they offer 75w90 and 75w110. Which would be better for the trans and diff? Would one weight be better for one and another weight for the other? The car is currently about 300whp, it is a daily driver and doesn't see track use but does get spirited driving.


This: Amsoil SVT 75W-110

I have 30K+ miles on the fluid in mine and it shifts perfectly, just like the day I filled it. Odd that the guys (some guy old scotty or soemthing) at NASIOC said it would degrade rapidly. Not the case at all. Put the same fluid in the rear diff.


Why 75W-110 over the spec'd 75W-90?

I had issues in my STI using Motul Gear 300 in the tranny. It was OK, but not very smooth. Adding Redline NS gear oil worked well, since it's absence of friction modifiers was ideal for synchro engagement. It wasn't perfect or even a night and day difference, but there was improvement in shift quality, from what I recall.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter

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