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Join Date: Apr 2009
Location: Cape Cod
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Most all debris is usually coating the surface of the pan as it falls out of suspension and the magnets catch the iron and steel. The filters I have seen are not plugged up and in my Avalon it is a metal screen that can be reused. I've done full exchanges on all my cars with no problems, They actually shift better, and after a throttle cable adjustment they shift as smooth as butter. 3 + gallons to do it until the fluid pumps out clean.
***The cable is called a " throttle cable " in my OEM Toyota repair manual.But it controls pressure in the trans.
My Avalon ATF was done at 170,000 miles As per the Car Doctors advice, I did 2 pan drains and refills and then after a few thousand miles I did a exchange . At 177,000 when I replaced the radiator, I did another fluid exchange since the ATF cooler lines were already off.
Some of this discussion reminds me of the old days when oil was non detergent and if your motor was all sludged up a switch to detergent oil could free up the sludge . And then there were those who did kerosene flushes at oil changes which in some ways are like when they introduce a chemical to clean out the trans = a flush.
As a test of your shop's knowledge ask them to adjust the "throttle cable" and tell you how they did it. A simple small adjustment makes a world of difference and all cables stretch some and will need adjustment for the trans to perform properly.