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Old 10-12-2000, 08:24 AM   #1
joostin420
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Member#: 1046
Join Date: Mar 2000
Location: New England, United States
Vehicle:
2007 WRX Wagon
UGM

Post diff. and MT fluids, which to use and why?

which fluids are recommended, Redline is talked about quite a bit. but what else is out there, and what is the best to use?

thanx,

justin

MY00 RS coupe MT
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Old 10-12-2000, 08:45 AM   #2
GTBGUY
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Member#: 2003
Join Date: Aug 2000
Location: Calgary, Alberta, Canada
Vehicle:
'99 BGP Legacy GT
'98 QS Legacy L (auto)

Post

Well, I use Motul Gear 300 for the rear diff and center diff. 75w90 full synthetic. It's great. Mobil 1 is also availible as is Castrol etc.
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Old 10-12-2000, 09:38 AM   #3
joostin420
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2007 WRX Wagon
UGM

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anyone else? especially what you used in each place, like i have read about Redline and 75w90NS goes in the trans. and regular 75w90 goes in the rear diff.. so what about with Mobil 1 for example is there different types for trans. and rear diff.?

thanx,

justin
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Old 10-12-2000, 10:25 AM   #4
AlpineSport
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Member#: 736
Join Date: Jan 2000
Location: Woodinville, Wa.
Exclamation

This question came up a while back and suddenly ended, with some ???s hanging. Having spoke to a couple of certified Subaru mechs., one thing seems to be certain: ONLY use a GL-5 gear oil. There is a case for added friction modifiers for Ltd.Slip not completely being compatable with the synchronizers. Both Redline & Mobil-1 websites offer non-LSD synthetics claiming: "this makes synchronizers come to equal speeds more quickly, allowing faster shifting...etc.." Mobilube-1 SHC & Redline 75W90 NS would appear to be the correct applications. Amsoil may also have a good product with proper properties. Here's the old thread. www.impreza-rs.com/NonCGI/Forum15/HTML/000286.html This info. applies to man. transmission. The rear diffs. can get away with the ltd. slip additives apparently.



[This message has been edited by AlpineSport (edited October 12, 2000).]
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Old 10-12-2000, 11:53 AM   #5
joostin420
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Join Date: Mar 2000
Location: New England, United States
Vehicle:
2007 WRX Wagon
UGM

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could anyone else shed some more light and experiences?

thanx,

justin
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Old 10-13-2000, 04:38 AM   #6
Bohanan @ work
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Location: Houston, TX
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Justin,

Trey has some info on his site. Pretty interesting reading.
http://www.cobbtuning.com/tech/gearoil/index.html

I'm in the same boat. Trying to figure out which lube to go with.

Adam
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Old 10-13-2000, 06:21 AM   #7
rjones
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Join Date: May 2000
Location: Cambridge, MA
Vehicle:
2003 wrx wagon
silver

Post

I have a ton of redline coming for my little winterization routine this weeked. 75W90NS is going in the tranny and 75W90 is going in the rear diff. I'm combining that with some 0W30 Mobil 1 in the engine for the colder times here in NH and Mass.

Hey now--Who knows if the washers on the tranny and diff plugs must be replaced during the change? And if so what part numbers and where to get them?

Thanks
rj
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Old 10-13-2000, 03:06 PM   #8
richeich
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Join Date: Apr 2000
Vehicle:
2001 Impreza 2.5RS
Silver

Post

Rear diff doesn't use a washer. I don't recall seeing one on the gearbox either, but maybe it's there and I just re-used it. It doesn't leak or anything.

I use Amsoil Series 2000 75W-90 gearlube in both the MT and rear diff. I haven't experienced any problems. (But then again, I sell it, so take it for what it's worth).

Whatever you use, it's got to be a GL-5 rated gear lube.

Rich


[This message has been edited by richeich (edited October 13, 2000).]
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Old 10-13-2000, 03:12 PM   #9
Jason
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Join Date: Jul 1999
Location: Fremont, CA 94538
Vehicle:
2000 Legacy GT Ltd
WHT

Post

I personally dont' lik Redline 75w-90NS.
I had in in my MY00 gearbox and it grinded really bad from 3rd-4th.

Now, I put Mobil 1 75W-90 in my MY00 Legacy and it hardly grinds.

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