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(formerly) 03 H6 OBW , (presently) 06 WRX Sportwagon & 2021 Honda CR-V
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sure it isn't a T-70 Torx ?

that's what I needed on my 06 WRX. got it at Amazon, or maybe Autozone, less than $6 or $7 IIRC.
 

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Car: 2008 Tribeca, 2010 LGT, Sold: 2005 XT Limited
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2,939 Posts
Let me suggest an alternate way to get a full flush DIY. You should still do a drain and refill to start off, but then use the existing pump in the transmission to pump the fluid out of the transmission, through the cooler and out a line you take off.

Directions are here: DIY 5EAT ATF Flush - Subaru Legacy Forums

You will have to modify the directions for the H6, but I bet its very close to the same.

This is the best way to do this! I know it seems like a bad idea to start your car with the transmission line unhooked, but this really does work well!
 

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1993 Legacy LSi with still functioning Air Suspension, 1999 Outback 2.5L 5MT lab Rat
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191 Posts
The transmission requires an 8mm Allen to drain, the Torx T70 is for the front differential to drain. You also notice that you'll likely need a 10mm allen to change the rear differential as well.
 
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