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I just changed my diff fluids this weekend, so I'll try to be of some help.
The drain plug to the front diff takes a 21mm socket. Per the factory manual it takes 1.2qts and 80w90 gear oil is recommended. I used Lucas 80w90 heavy duty high performance gear oil.
The rear diff is drained and filled from two circular plugs in the back which are loosened/tightened with the stub end of a 1/2" socket wrench. It takes 0.8qts and 75w90 gear oil. I decided to go with a slightly heavier gear oil for the rear diff as I drag race a lot. I also used Lucas 80w90 gear oil.
I previously used Mobil 1 synthetic gear oils in my diffs, but didn't like how they ran like water. I prefer a thicker high temp gear oil.
-Chike
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2013 Cosmic Blue 5spd Evo X GSR
2006 Galaxy Gray 6MT RX-8 (sold)
2006 Steel Gray WRX TR (sold)
1996 Brilliant Red SVX L (sold)
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