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Old 02-28-2005, 05:50 PM   #1
Scooby Specialist
Member#: 42979
Join Date: Sep 2003
Location: houston tx
03 wrx
blizzzack stage IV

Default Replacing rear diff fluid, have a few questions.

Hello, well my first question is what fluid weight does the wrx require in the rear diff? and whats the easiest way to replace it? how much fluid should i buy? thanks.
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Old 02-28-2005, 06:15 PM   #2
Scooby Specialist
Member#: 72630
Join Date: Oct 2004
Location: CA
2004 STi


I used Redline 75-90 NS. Drain it from the drain plug (I jacked up the front to drain as much as I could). Then plug it up, remove fill plug and fill to brim, I think its like 0.8 quarts. It is very simple to do, like changing oil. As long as you use 75-90 or 80-90 you will be OK. Many people use many different brands, synthetic, non synthetic, cocktails ect.. search and decide. Lots of threads about this stuff in service and maintenence
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Old 02-28-2005, 07:55 PM   #3
Trust no one
Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
02 WRX
15 WRX/05 GTO


Your owners manual lists all the proper fluids and viscosities that should be used.
When servicing the rear diff, it's a very, very good idea to remove the fill plug FIRST before the drain plug, to be sure you can get the fill plug out. Sometimes they are in very tight and can be difficult to remove. Should you be unfortunate enough to have this happen, you may end up with an empty diff and an undriveable car.
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