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DISCLAIMER: I have zero experience with the FRS/BRZ auto transmission.
If you car is automatic, it would probably be worth it to have the dealer do the fluid exchange on the transmission. Most modern automatics don't have a drain plug for trans fluid, and if they do, you're only going to get 20-40% of the old fluid out. Generally auto transmission fluid exchanges are done with a special machine that attaches in-line with your cooler hoses and will remove old fluid and replace with new while the vehicle is running on a lift.
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