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Subaru LEgacy GT 5MT trans fluid? #4478192
08/03/17 12:10 PM
08/03/17 12:10 PM
Joined: May 2010
Posts: 1,126
Ocala, Florida
racin4ds Offline OP
racin4ds  Offline OP
Joined: May 2010
Posts: 1,126
Ocala, Florida
Been doing some research on the best fluid for my wifes 08 Legacy with the 5MT, its very "notchy" IMO and I Hear thats a common complaint with these boxes unless you put the right fluid in them. I changed it last year when we bought it and just used Valvoline &%w90 GL-5 like it called for but I'm not liking it.

Many say to use Redline 75w90NS, some say royal purple syncromax, some say the Pennzoil synchromesh etc... what will give me smooth shifting and proper protection for this already weak gearbox?

Any personal experience?


Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
08 Legacy GT
Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds] #4478207
08/03/17 12:22 PM
08/03/17 12:22 PM
Joined: Feb 2012
Posts: 3,870
NEUS
Bandito440 Offline
Bandito440  Offline
Joined: Feb 2012
Posts: 3,870
NEUS
Notchy is right. Here's a list of what I've used in Subaru 5-speed gearboxes over the years, from best to worst.

Subaru Extra S (discontinued)
Mobil Delvac 1
Red Line NS
Motul Gear 300
Valvoline Conventional
Subaru HPGO (replaced Extra S)
Amsoil Severe Gear (this was especially grindy)
... others ...

If you can find the Delvac, that was my favorite out of what's still produced. A local Mobil distributor may be able to help.


'14 Grand Cherokee EcoDiesel
Rotella T6 5w-40 & OEM filter
Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds] #4478210
08/03/17 12:25 PM
08/03/17 12:25 PM
Joined: Mar 2012
Posts: 1,370
San Antonio, TX
E150GT Offline
E150GT  Offline
Joined: Mar 2012
Posts: 1,370
San Antonio, TX
Friend of mine is a big subaru guy. He says the Scoob people make a concoction out of different brands in different quantities for the best feel. You'd have to look through the subaru forums. Subaru people can be really weird.


1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 251k 5w30
2016 Mazda6 Touring 6MT - 57k 10w30
2006 Buick Lucerne CXL 3.8 31k 5w30
Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds] #4478223
08/03/17 12:33 PM
08/03/17 12:33 PM
Joined: Aug 2008
Posts: 340
NJ
Padawan Offline
Padawan  Offline
Joined: Aug 2008
Posts: 340
NJ
Since the discontinuation of Extra-S, the only fluid I'd use is the Subaru High Performance Gear Oil.

Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds] #4478246
08/03/17 12:52 PM
08/03/17 12:52 PM
Joined: Dec 2008
Posts: 3,116
Occupied Virginia
Bottom_Feeder Offline
Bottom_Feeder  Offline
Joined: Dec 2008
Posts: 3,116
Occupied Virginia
Subaru's own Extra-S was fantastic stuff but is now apparently scarce if not gone.

Fred Beans in Doylestown PA used to break it down into quarts and sell it on Amazon which is where I got mine. It may be worth a call to their parts department: https://www.fredbeans.com/

Beyond that, any cocktail recipe you find online is just a band-aid for worn synchros.

Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds] #4478261
08/03/17 01:04 PM
08/03/17 01:04 PM
Joined: Aug 2003
Posts: 13,143
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,143
NE,Ohio
As someone who owned one of those subaru MT's (and multiple other subaru MT)

I've heard good things about the Delvac gear oil.

I personally feel the motul gear 300 was the best I used.. followed by the redline 75w90NS, then supertech 75w90 blend.

I would stay away from smurfblood and any other exotic mixes.
Make sure you are using a GL-5 rated gear oil.. many MT specific gear oils are only api GL-4.


2019 Jeep Cherokee Trailhawk 2.0T
Re: Subaru LEgacy GT 5MT trans fluid? [Re: Bottom_Feeder] #4478262
08/03/17 01:05 PM
08/03/17 01:05 PM
Joined: Feb 2012
Posts: 3,870
NEUS
Bandito440 Offline
Bandito440  Offline
Joined: Feb 2012
Posts: 3,870
NEUS
Originally Posted By: Bottom_Feeder
Subaru's own Extra-S was fantastic stuff but is now apparently scarce if not gone.

Fred Beans in Doylestown PA used to break it down into quarts and sell it on Amazon which is where I got mine. It may be worth a call to their parts department: https://www.fredbeans.com/

Beyond that, any cocktail recipe you find online is just a band-aid for worn synchros.

The Extra-S is long gone. Some folks have been selling the new HPGO as Extra-S. It's not, and it's awful in the 5-speed gearboxes.


'14 Grand Cherokee EcoDiesel
Rotella T6 5w-40 & OEM filter
Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds] #4478281
08/03/17 01:29 PM
08/03/17 01:29 PM
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
GL-5 MT is for HD truck NON syncromesh trans. It will kill blocker spinup on a PC tranny with phos bronze rings.

So have good synchro action and kill the differential gearset with GL-4.


2014 Nissan Rogue S CVT, OC#10 47272mi-QSUD10W30+5w20 Toughguard Filter; '17 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter
Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds] #4478353
08/03/17 03:11 PM
08/03/17 03:11 PM
Joined: Dec 2011
Posts: 598
Upstate NY
Wheel Offline
Wheel  Offline
Joined: Dec 2011
Posts: 598
Upstate NY
I'd stick with Subaru High Performance Gear Oil, or Motul Gear 300. Subaru does call for a GL-5 in it's manual trans, but I've had better performance (less notchiness) with these two.
Don't use a cocktail.


2009 Subaru Legacy (N/A)
Castrol Edge and Subie (Fram) filter
Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds] #4478457
08/03/17 05:43 PM
08/03/17 05:43 PM
Joined: Oct 2002
Posts: 47,287
Duvall WA - Pacific NW USA
Pablo Offline
Pablo  Offline
Joined: Oct 2002
Posts: 47,287
Duvall WA - Pacific NW USA
Originally Posted By: racin4ds
Been doing some research on the best fluid for my wifes 08 Legacy with the 5MT, its very "notchy" IMO and I Hear thats a common complaint with these boxes unless you put the right fluid in them. I changed it last year when we bought it and just used Valvoline &%w90 GL-5 like it called for but I'm not liking it.

Many say to use Redline 75w90NS, some say royal purple syncromax, some say the Pennzoil synchromesh etc... what will give me smooth shifting and proper protection for this already weak gearbox?

Any personal experience?


I've been using Amsoil 75W-110 (not 75W-90) in my 2014 WRX for 30K miles and it's still as slick as the day I put it in: Amsoil 75W-110


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


Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds] #4478878
08/04/17 08:17 AM
08/04/17 08:17 AM
Joined: May 2010
Posts: 1,126
Ocala, Florida
racin4ds Offline OP
racin4ds  Offline OP
Joined: May 2010
Posts: 1,126
Ocala, Florida
Thanks Guys, yea I'm seeing the same thing... all kinds of concoctions and mixes these subaru guys use... Not too fond of the mixing.

I think I'm just going to go with the Redline NS first, many praise that stuff and its easy to get.


Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
08 Legacy GT
Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds] #4478941
08/04/17 10:05 AM
08/04/17 10:05 AM
Joined: Jun 2002
Posts: 19,522
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,522
Iowegia - USA
Originally Posted By: racin4ds


...Many say to use Redline 75w90NS, some say royal purple syncromax, some say the Pennzoil synchromesh etc... what will give me smooth shifting and proper protection for this already weak gearbox?...

Any personal experience?


I would not use any of the above since they don't have the right viscosity or wear protection, or friction modification, nor do most carry they carry the GL rating your common sump gearbox requires.

I would recommend:

https://www.redlineoil.com/product.aspx?pid=43&pcid=7


Scars remind us of where we have been, but do not have to dictate where we are going.
Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds] #4479184
08/04/17 04:38 PM
08/04/17 04:38 PM
Joined: Oct 2007
Posts: 1,689
Auburn, GA
KenO Offline
KenO  Offline
Joined: Oct 2007
Posts: 1,689
Auburn, GA
MotulGear 300 75W-90 seems to work very well in the Subaru 5MT from personal experience. Redline is not a good idea, the Redline 75W-90NS sucks, it'll ruin the synchros in no time and make it VERY hard to shift. The best fluid used to be the old Subaru 'Extra S', which is NLA and even if they tell you they have it - they don't, what they're selling over the counter is a 75W-90 conventional or at ebst syn blend gear oil. Don't bother with that stuff.

And I also agree with Molakule, the Synchromesh's are just the wrong fluid for this application. I've never tried the 'Smurf Blood' in them though. You really think thats an OK fluid for them?


1995 Volvo 960 ShagginWagon
1995 BMW 328ti
1997 Chevy C2500 5.7l V8
2003 BMW 530i (deceased :()
1998 Mercedes E300 Turbogreasel

Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds] #4481723
08/07/17 10:32 AM
08/07/17 10:32 AM
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
Nevr hear d a Subaru MT gearbox called weak!

Now a B-W T5 in a ford mustang - there's a piece of , well boat anchor.


2014 Nissan Rogue S CVT, OC#10 47272mi-QSUD10W30+5w20 Toughguard Filter; '17 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter
Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds] #4482146
08/07/17 06:31 PM
08/07/17 06:31 PM
Joined: Aug 2004
Posts: 2,018
5600 feet elevation, Arizona
double vanos Offline
double vanos  Offline
Joined: Aug 2004
Posts: 2,018
5600 feet elevation, Arizona
Motorcraft XT-M5-QS. Worked wonders in my gen 1 mazdaspeed 3.


Sabine Schmitz is the Queen of the 'Ring; Svetlana Kapanina is the Queen of the SKIES...
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