How to: Subaru STi Transmission and Rear Differential Fluid Change

It is recommended to replace or inspect the transmission and rear differential fluid every 30,000 miles or 3 years. The process of replacing the fluid in your Subaru transmission and rear differential can be a little bit messy, but also fairly easy.

Note: Torque specs and socket sizes may of have changed through the years and models. Confirm your specific vehicle! Especially the rear diff has changed quite a few times.

Helpful tools:
Fluid Pump:
T70 socket:
22mm deep socket:

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**Disclaimer: This video is for educational purposes only. The creators and contributors of this video are not responsible for any damage or injury that may occur while attempting the procedure shown. Always exercise caution and seek professional advice if needed.
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0:00:00 - Changing the Transmission Fluid
0:01:46 - Changing the Rear Differential Fluid