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#4478192 - 08/03/17 01:10 PM Subaru LEgacy GT 5MT trans fluid?
racin4ds Offline


Registered: 05/07/10
Posts: 958
Loc: 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?
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Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
08 Legacy GT
2008 Kawasaki Ninja 650R

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#4478207 - 08/03/17 01:22 PM Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds]
Bandito440 Offline


Registered: 02/13/12
Posts: 3854
Loc: 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.
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'14 Grand Cherokee EcoDiesel
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#4478210 - 08/03/17 01:25 PM Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds]
E150GT Offline


Registered: 03/11/12
Posts: 1093
Loc: 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.
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1984 Mercedes-Benz 300SD - 100k
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2016 Mazda6 Touring 6MT - 56k 10w30

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#4478223 - 08/03/17 01:33 PM Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds]
Padawan Offline


Registered: 08/24/08
Posts: 333
Loc: NJ
Since the discontinuation of Extra-S, the only fluid I'd use is the Subaru High Performance Gear Oil.

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#4478246 - 08/03/17 01:52 PM Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds]
Bottom_Feeder Offline


Registered: 12/07/08
Posts: 3006
Loc: 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.

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#4478261 - 08/03/17 02:04 PM Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds]
Rand Offline


Registered: 08/20/03
Posts: 12638
Loc: 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.
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#4478262 - 08/03/17 02:05 PM Re: Subaru LEgacy GT 5MT trans fluid? [Re: Bottom_Feeder]
Bandito440 Offline


Registered: 02/13/12
Posts: 3854
Loc: 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

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#4478281 - 08/03/17 02:29 PM Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11964
Loc: 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.
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2014 Nissan Rogue S CVT, OC#9 41392mi-QSUD10W30 + M110A CHAMP Filter; 2017 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter

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#4478353 - 08/03/17 04:11 PM Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds]
Wheel Online   content


Registered: 12/22/11
Posts: 570
Loc: 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.
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2009 Subaru Legacy (N/A)
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#4478457 - 08/03/17 06:43 PM Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds]
Pablo Offline


Registered: 10/28/02
Posts: 47275
Loc: 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
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#4478878 - 08/04/17 09:17 AM Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds]
racin4ds Offline


Registered: 05/07/10
Posts: 958
Loc: 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
2008 Kawasaki Ninja 650R

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#4478941 - 08/04/17 11:05 AM Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: 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

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#4479184 - 08/04/17 05:38 PM Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds]
KenO Online   content


Registered: 10/29/07
Posts: 1674
Loc: 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


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#4481723 - 08/07/17 11:32 AM Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11964
Loc: 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#9 41392mi-QSUD10W30 + M110A CHAMP Filter; 2017 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter

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#4482146 - 08/07/17 07:31 PM Re: Subaru LEgacy GT 5MT trans fluid? [Re: racin4ds]
double vanos Offline


Registered: 08/05/04
Posts: 1884
Loc: 5600 feet elevation, Arizona
Motorcraft XT-M5-QS. Worked wonders in my gen 1 mazdaspeed 3.
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