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The 2009 Subaru Legacy initially came with a 4-speed automatic transmission, but the more advanced trims will have a 5-speed automatic transmission. Both versions require Dexron VI automatic transmission fluid, which is widely available at local stores. The 4-speed model needs 9.8 US quarts for a complete refill, while the 5-speed model requires just under 11 US quarts.
The ATF Type F automatic transmission fluid is what you need for the 2009 Subaru Legacy.