Join Date: Jul 2004
Location: Northern Virginia
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120K miles on the original transaxle fluid? Bit on the long side, even for relatively stress free driving conditions.
As long as you do a drain and refill at regular, short intervals, transaxle flushing is generally not necessary. Also depends on the type of transaxle service being done - some flushes run through the dipstick, some through the cooler lines. The best ones run through the pump pickup - which require the transaxle pan to be dropped and the filter assembly removed.
Most owners reported good results with a 30K miles drain and refill schedule. If you tow or drive hard - then dropping it to 15K miles wouldn't hurt. I believe the 2005 models years still spec'd a Toyota Type T-IV ATF, which is a conventional oil base with a specific friction modifier. Still with Toyota Type T-IV or if you go aftermarket, make sure it says in writting - compatible with Toyota Type T-IV.
Transaxle takes approximately 4 quarts with a drain and refill. Assuming the pan hasn't been off the car, good idea to drop the pan and clean/replace the filter inside. Also can gauge if there is any issues with excessive wear - bottom of the pan will have some metal slurry, nothing to worry about - but if there is any larger chunks of metal or metal shavings, then you might have some cause for concern.
2002 Toyota Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Toyota Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Toyota Matrix XRS, 2.4L 2AZ-FE VVT-i
2009 Toyota RAV4 Limited, 2.5L 2AR-FE Dual VVT-i