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The 2010 Toyota Corolla has a transmission fluid capacity of 6.9 quarts, but you'll usually only need 4 quarts for a simple "drain and fill" procedure. This involves replacing a little over half of the current automatic transmission fluid. Toyota claims the ATF is a lifetime fluid that doesn't require regular changes. However, changing it can help keep any particles or debris out of your transmission. You can purchase Toyota's 00289-ATFWS Lexus & ATF WS World Standard fluid for $45 on Amazon, which provides a 4-pack of 1 quart bottles, likely sufficient for a drain and fill task.
In 2010, the transmission fluid capacity for a Toyota Corolla is 3.1 quarts.