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Old 03-10-2004, 02:29 PM   #1
Scooby Newbie
Member#: 19683
Join Date: Jun 2002
Location: Dearborn, MI
2002 Subaru

Default transmission flush and fill

I am planning to change fluids in the rear diff and transmission. I am under the impression that I can use just about any 75w90 oil synthetic or not in either one. Can anyone tell me exactly how much oil to add to each after draining? Also do I need new crush washers to perform this maintenence? I have never done this before and just want to be prepared before diving in.

Does anyone know of a post that describes how to do this maintenence?

Can the used tranny fluid be disposed of with regular engine oil?

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Old 03-10-2004, 02:35 PM   #2
Scooby Guru
Member#: 44168
Join Date: Sep 2003
Chapter/Region: SCIC
Location: In your pant[ie]s.
2017 Silver Forester
with not enough lights...


I'm going off memory here so anyone feel free to correct me (i'm at work so i don't have my big list of values with me...)

Transmission: 3.8 quarts (i think...)
Rear differential: Fill until fluid starts to drip out of differential fill hole

There's no crush washers for either. Just make sure to properly torque down each bolt. I'm sure someone will post the torque values (or you can do a search).

Oh yeah, it helps to have the car on level ground when doing it. Jack up the front/rear to get to the plugs, but when draining the fluid, let the car back down to help drain everything.

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Old 03-10-2004, 02:54 PM   #3
Scooby Specialist
Member#: 19057
Join Date: May 2002
Chapter/Region: MWSOC
Location: The Lost Valley, Detroit, MI
2002 WRX
& Blue Ford & '72 CB350


Also -- you should pick your fluids carefully... Every body likes a different shifter feel... There are plenty of posts on here about what to choose and what you can expect.... Go to the tranny fourm.

And yes most (if not all) recyclers will accept used tranny fluid also (gear lube not ATF fluid)

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Old 03-10-2004, 03:29 PM   #4
Scooby Specialist
Member#: 17904
Join Date: Apr 2002
Chapter/Region: MAIC
Location: NOVA -> HI -> NOVA
010 STI


There is a washer for the tranny, I found this out the hard way when I saw it in the oil pan after I had already filled the car up with new fluid, had to drain it and then refill it
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Old 03-10-2004, 06:44 PM   #5
Scooby Guru
Member#: 22412
Join Date: Aug 2002
Chapter/Region: SWIC
Location: Albuquerque, NM
2012 Legacy 2.5GT
Ice Silver Metallic


The transmission does take a copper gasket - part no. is 803926070

Transmission takes 3.7 qts. and the rear differential 0.8 qts - both recommend a GL-5 rated 75W90 gear oil

Lots of conflicting info on what to put in and what not to put in the transmission - just look around the site.

I am using Motul Gear 300 in both the transmission and differential and have had no problems at all.

for info on how to do it, check out www.scoobymods.com
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Old 03-10-2004, 06:48 PM   #6
Scooby Specialist
Member#: 24569
Join Date: Sep 2002
Chapter/Region: South East
Location: East Tennessee
2004 Mazda RX8


I am using 80w90. Peanut butter for a few minutes, but then it feels really good...I woulda used 75w90, but it is hard to find.

I recommend putting in three quarts and checking the level to see where you are on the dipstick. I over filled and had to drain a bit.

Buy one of those big rubber dish washing gloves so you don't get crap all over your hands.
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Old 03-11-2004, 06:17 PM   #7
Butt Dyno
Street's closed, pizza boy
Member#: 17301
Join Date: Apr 2002
Chapter/Region: MAIC

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