I have a fluid suction device that sucks the engine oil out of the dipstick tube, I use it to suck out the transmission fluid from my Corolla too. It only sucks out about 3 L of the 6 L that is in the transmission, so I do this procedure twice, one at one oil change, then I do it again a few months later at the next engine oil change. Three 1-L containers of Toyota Transmission fluid is only about $30, so doing this twice cost me $60 ( Canadian dollars ). This is just for the transmission fluid, no other costs. So if you want to do it yourself then go ahead and pump it out, for about $60 just for the cost of the fluid alone.
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