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Old 07-23-2007, 08:33 AM   #1
Jaylyons1
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Join Date: May 2006
Chapter/Region: MAIC
Location: Baltimore, MD
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2013 BRZ
Black

Default Rear diff leaking oil...

OK, so under the car again yesterday and I noticed some oil on my rear sway bar. Very confused, I looked around and it didnt take long to see some oil on the rear diff. its qutie a bit above the filler plug and seems to be coming from one of the bolts. I researched this topic and found that the only stuff I could find were people with their rear diff seizing up or making noise, which mine doesnt do.

My main question, is what kind of oil do you put in the rear diff? I figure I will check it and make sure its full and try to tighten that bolt. Not sure if a seal is broken or not. But If its low Ill probably just empty it out and refill it since your not supposed to mix oils.(and I have no clue what oil is in there now)

It doesnt leak while sitting still, but it did have some on the sway bar and a bit on the diff so wanted to fix this problem before it got serious.
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Old 07-23-2007, 11:17 AM   #2
wuuusaa
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remember c street, that might be the cause of it leaking

Last edited by wuuusaa; 07-23-2007 at 11:23 AM. Reason: i was going to delete, but ill leave it alone
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Old 07-23-2007, 11:40 AM   #3
edo2000
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Location: Kenai Peninsula, AK
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2012 WRX
red

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On a wrx, you use the same oil that you use in the transmission - 75w90 gear oil. I imagine its the same with an STI.
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Old 07-23-2007, 02:06 PM   #4
Getagrip
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STi rear diff oil is different. USE THE SUBARU STUFF. It come is a tin can and Conti has it in stock. We have not seen an aftermarket substitute. Play it safe and get the Subaru stuff.
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Old 07-23-2007, 02:14 PM   #5
Jaylyons1
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Quote:
Originally Posted by ol'skoolwrx View Post
remember c street, that might be the cause of it leaking
I didnt ask what caused it, lol. Plus I really didnt get on it that hard. I figure if I'll have many seals, clams, hoses, and other odds and ends to replace over the life of the car anyway.
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Old 07-23-2007, 08:36 PM   #6
wuuusaa
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Quote:
Originally Posted by Jaylyons1 View Post
I didnt ask what caused it, lol. Plus I really didnt get on it that hard. I figure if I'll have many seals, clams, hoses, and other odds and ends to replace over the life of the car anyway.
probably might just be wear and tear, that is what i was getting at.
b/c mines kind of do a little bit
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Old 07-23-2007, 11:32 PM   #7
Wes_FSTGDB
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Do you change it regularly? Should change it once after every 10,000 miles. I'll have to get it done before this winter, almost at that point. Especially if you drag race or Auto X a lot. After one season my fluid was pitch black in the rear diff.

Stuff last a long time as long as it's maintained.

-Wes
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Old 07-24-2007, 01:39 AM   #8
00Maddog
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2004 ra'd redrex in
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the vent is on the top of the rear cover. sounds like it's overfilled a bit and you got er warm enough to spew some out. i see it all the time on all types of subarus.
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Old 07-24-2007, 11:59 PM   #9
Jaylyons1
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Quote:
Originally Posted by 00Maddog View Post
the vent is on the top of the rear cover. sounds like it's overfilled a bit and you got er warm enough to spew some out. i see it all the time on all types of subarus.
Ok, cool. Ill still pick up some oil tomorrow @ subaru and change it out. Gotta order me a 02 sensor also, it turns out that was in fact the problem with the black one. Put the one from the 04 in and it is as good as new!
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Old 07-25-2007, 04:20 AM   #10
00Maddog
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2004 ra'd redrex in
8k w/ STI kit :) DASH

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get a pump or come borrow mine! it's a pita to get oil in the rear diff.
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Old 07-25-2007, 12:40 PM   #11
Firestrike
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2006 Impreza WRX LTD
Cloaking Device Gray

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Quote:
Originally Posted by Jaylyons1 View Post
Ok, cool. Ill still pick up some oil tomorrow @ subaru and change it out. Gotta order me a 02 sensor also, it turns out that was in fact the problem with the black one. Put the one from the 04 in and it is as good as new!

*chimes in*
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