Quote:
Originally Posted by delloro
And magnets.
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The video shows the amount of
magnetic material captured by four (4) magnets widely spaced around the pan after ~135,000 miles.
Three (3) ways
non-metallic material is captured in a sealed transmission are: (1) very fine particles remain suspended in the fluid, (2) some particles cling to the pan and strainer and (3) large particles that would bind in close clearances are captured by a large surface area strainer that is likely to hold a lot of material without significant flow restriction.
These are robust design details that contribute to legendary Toyota reliability.
I rarely incur special operating conditions, so I recently exchanged 12 quarts at 114,000 miles and didn't open the pan. As a result of watching the video, I'm planning to wait until 180,000 miles to inspect and back flush the strainer with used ATF, replace strainer o-ring, clean the magnets, clean the pan and change 12 quarts of fluid.
Incidentally, in 2012, a GM TSB recommended no external transmission fluid exchange, drain and fill only, which implies do not open the transmission pan. I find it very hard to agree with that recommendation for obvious reasons that have been thoroughly discussed on this forum (and moreover, I would never buy a GM product).