Here's my (aftermarket) magnetic transmission drain plug after 34,732 on the fluid. Car has ~179K on it, runs like a kitten; trans fluid has been changed 3 times; ~90K, ~144K and now. Transmission is a 4t65e behind a 3800 in an old Lesabre. Factory square magnet was also saturated. I added 4 magnets to the pan area; 2 glued to the pan and 2 more on the filter near the intake. In my mind, I just thoroughly convinced myself to do 30K transmission fluid changes forever, regardless of manufacturer claims otherwise. Thoughts? Criticisms?