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Old 12-03-2005, 02:40 PM   #1
umscooby
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Member#: 50902
Join Date: Dec 2003
Chapter/Region: RMIC
Location: The Mountains
Vehicle:
05 STi
White

Default gear oil/differentials

just wondering the quantities needed to change the dif. oil in all three difs. any other input is appreciated too.
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Old 12-03-2005, 03:40 PM   #2
Jon Bogert
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Join Date: Mar 2000
Location: SE PA
Vehicle:
09 GTR, 02 996 C4S
95 993 C4, 71 911, 04 STI

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You only put special oil (LSD oil) in the rear. Capacity is about a liter--officially ".9L to 1.1L (1.0-1.2 qt)"
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Old 12-03-2005, 06:52 PM   #3
Samurai Jack
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2002 Enemy of Aku

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According to the '04 Manual:
MODEL 2.5 L Turbo STi, 6MT
Rear differential T-type model with LSD Mechanical
Oil capacity = 1.0 1.2 US qt
Rear differential gear oil GL-5 (For mechanical LSD)

There is no value for a Front Differential.

The transmission gets 4.3 U.S. Quarts.

I haven't heard of anyone using "Special LSD" gear oil. As far as I know, everyone on the board, or those that have spoke up at 1 time or another, are using some form of synthetic, ie; Redline, or plain Dino oil, or some otjer concoction that they threw together.
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Old 12-03-2005, 07:13 PM   #4
Hayes
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Location: Cape Coral,FL
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According to my 2000 manual. Front differental 80/90 GL5 gear oil. Rear differental 75/90 GL5 gear oil. The LSD does not require any special gear oil other than it must meet the GL5 spec.
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Old 12-05-2005, 09:38 PM   #5
kendogg41
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Location: Auburn, GA
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1995 LS Swapped Volv
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What type of friction modifier is needed for a subaru LSD? It's IMPOSSIBLE that you need NO friction modifier for a LSD unit. Or do most people use like the redline that already has the modifier mixed in?
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Old 12-06-2005, 06:38 AM   #6
heffergm
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Location: Northern VA
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2003 wrx
WR Blue Pearl

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No, it's not impossible. The WRX uses a sealed LSD. There's no need to add friction modifier.

Quote:
Originally Posted by kendogg41
What type of friction modifier is needed for a subaru LSD? It's IMPOSSIBLE that you need NO friction modifier for a LSD unit. Or do most people use like the redline that already has the modifier mixed in?
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Old 12-06-2005, 07:10 AM   #7
Jon Bogert
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95 993 C4, 71 911, 04 STI

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The original poster has an STI with a plate type rear LSD. If you do not have an STI, you have a viscous coupling rear LSD. Apples and oranges. When you read or post, make sure you know which one is being referred to.
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