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Old 07-16-2003, 01:48 PM   #1
IA Performance
Former Vendor
Member#: 25194
Join Date: Sep 2002
Chapter/Region: RMIC
Location: Boulder, CO
2008 Forester XT 5mt
Dark Gray

Default comperable fluids to teh OE ones? tranny, diff, brake

I'm looking to pop down to autozone today and pick up some fluids that are similar to the factory ones. They are for a stock 5spd wrx wagon.

Brake fluid?
Tranny fluid?
Rear diff fluid?

Many thanks in advance. I'm trying to stay away from synthetic in the tranny and brake fluid.
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Old 07-16-2003, 11:33 PM   #2
Scooby Guru
Member#: 10309
Join Date: Sep 2001
Chapter/Region: NWIC
Location: Seattle, WA
'02 OBS 2-tone!
'95 Montego Miata


For brake/clutch fluid, I would actually suggest going with Valvoline Synpower DOT3/4 synthetic fluid. It's not very expensive, and does perform better (higher boiling point) than standard DOT 3 or DOT 4 fluids. No downside (except for a few dollars), decent upside.

For rear diff (which should be GL-5 spec), just get a good 75w90 GL-5 gear oil. Synthetics can be helpful here in reducing running temps.
For manual transmission, which has bronze(?) synchros, a different mix of wear additives may be needed to prevent damage to the synchros -- use whatever the owners manual/shop manual says (sorry, don't have mine handy right now).
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Old 07-17-2003, 01:02 AM   #3
Scooby Guru
Member#: 22452
Join Date: Aug 2002
Chapter/Region: MWSOC
Location: Grand Rapids, MI
2016 WRX


I've been using Moble 1 in the tranny and rear diff for a couple years and love it. Its a little expensive though.
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