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Old 05-25-2005, 11:10 AM   #1
chrisfranklin
Scooby Specialist
 
Member#: 59737
Join Date: Apr 2004
Location: louisville, ky
Vehicle:
2004 sti
crappy subaru white

Default My gear oil odyssey. (non tech info inside)

i don't have any oil analysis to post, or any hard scientific data.
just my experiences with my various gear oil concoctions.
follow along...

1. stock fluid changed out @ 20k miles
why?
i was doing my rear diff and figured what the heck. bad move...
stock tranny fluid looked excellent.
switched to valvoline semi synth 75w90 gl5
tranny liked it ok, for about 1k -1.5k miles.
had comments on how the gear box felt smoother @ first.
eventually a dreaded 4-5 grind reared it's ugly head.

2. switched over to pennzoil 80w-90 gl5 dino oil
similair results, but 5th gear grind was still there.

3. switched to a mix of the pennzoil syncromesh & pennzoil dino oil
approx 25% syncromesh
grind stayed away for a while, and only seemed to be there when shifting near redline in 4th gear.

4. switched to a higher mixture of syncromesh. approx 40% w/ pennzoil
grindage

at this point i chalked it up to being one of the unlucky ones with a crummy syncro issue.

unfortunately i was already into a turbo swap, and had already installed an act hd street and strip clutch, so i assume my warranty is shot.

i do the turbo upgrade and while driving down to atlanta for tuning (7hours) my 5th gear grind is getting worse.
it's grinding in anything over 4500 rpm's in 4th when shifting to 5th.
at this point i'm ready to drive said car into a river.

since subaru of gwinette deals in performance upgrades i figured i'd pitch my problem to them and get their take on it.

first i asked what gear oil they use.
A: subaru 75w-90 gl5. comes in some 5 gallon black and grey metal container with japanese writing on it.
(very JDM yo, and easily a 5 pony pickup, so i say eff it and put her in)

they swap my fluid and tuning begins.

while road tuning, my tuner even comments on how bad it is.
i'm thinking, maybe i'm in luck.
2 days of driving, quite a bit of struggling to get it into 5th, and i'm still at a loss.
dealer says the tranny warranty would be a tough sell due to all the mods and having the act clutch installed.

eventually when tuning finished and i was sent on my way home, feeling pretty dejected.

well, guess what......

after a couple days of the subaru goodness in there, and over a 1k miles since the swap, my 5th gear grind seems to be gone.
(of course after posting this thread, my motor will probably pop)

this is a blessing and the opposite of what has happened in the past because instead of the grind going away initially an dhten coming back, it worked in reverse.

thanks for reading, and my suggestion is give the real deal subaru fluid a shot
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Old 05-25-2005, 05:07 PM   #2
zinc99
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Member#: 56030
Join Date: Feb 2004
Location: Long Beach, CA
Vehicle:
02 stage 2 wagon
Silver

Default

I had the same deal, went all redline 75-90ns, realy hard to get in gear and not that great. Went to 30% sencromesch and old valvoine 75-90, got some grind and not very good shifting. Went all valvoine 75-90 just like new, I am only going to put in regular valvoine 75-90 for now on.
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Old 05-25-2005, 05:25 PM   #3
Tex-WReX
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Member#: 7107
Join Date: Jun 2001
Chapter/Region: TXIC
Location: Pearland
Vehicle:
2014 Mustang GT
White

Default

Same thing solved my problem. It is a fluid that was used for the Subaru Justy years ago to solve grinding issues. I am @ 93k miles on my 02, and swapped in the fluid about 30k miles ago. I am about to change it out again and see how it looks. The problem went away 100% within a few days.
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Old 05-25-2005, 06:15 PM   #4
ydant
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Join Date: Sep 2003
Chapter/Region: MAIC
Location: Herndon, VA
Vehicle:
2009 STI
The Good Grey

Default

Only synthetics I've managed to go more than 5k on are castrol syntech and Redline MT90. Everything else has exhibited the stated 5->4 grind.

This really is one of those things where you chouldn't change from stock unless you have a good reason to.
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Old 05-25-2005, 07:39 PM   #5
Tim Sanderson
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Member#: 6486
Join Date: May 2001
Chapter/Region: MWSOC
Location: S.E. wisconsin
Vehicle:
00 Impreza 2.5 RS
Blue Ridge Pearl

Default

I ran stock fluid only till 80k. By then I was grinding going into 4th and 5th above 3k rpms. I'm using amsoil series 2000 20w50 motor oil in my tranny. It took a couple days but the grinding is gone and has'nt come back. I now have 137k miles. I posted this before and got a bit of flack.
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Old 05-25-2005, 08:25 PM   #6
ydant
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Chapter/Region: MAIC
Location: Herndon, VA
Vehicle:
2009 STI
The Good Grey

Default

Quote:
Originally Posted by Tim Sanderson
I ran stock fluid only till 80k. By then I was grinding going into 4th and 5th above 3k rpms. I'm using amsoil series 2000 20w50 motor oil in my tranny. It took a couple days but the grinding is gone and has'nt come back. I now have 137k miles. I posted this before and got a bit of flack.
Interesting choice. I'd be interested to see the inside of that tranny.
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Old 05-25-2005, 10:27 PM   #7
Tim Sanderson
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Member#: 6486
Join Date: May 2001
Chapter/Region: MWSOC
Location: S.E. wisconsin
Vehicle:
00 Impreza 2.5 RS
Blue Ridge Pearl

Default

Well I do need to change the shift selector rod seal, but That's not going to show much of the gears. If I think of it I'll take some pics while I'm in there.
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Old 05-27-2005, 05:05 AM   #8
eakins
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