Just curious. Value of a filter is obvious enough. But some trannies, e.g. my Honda Odyssey, don't use a filter. Why not, if it's so important? On the Odyssey, the drain plug is magnetic, so it attracts the metal debris. But not really much on there, even after 45,000 miles (I did a few drain and fills with a topsider in between).

EDIT: My 02 Odyssey may have a filter, but replacing it is certainly not part of the scheduled maintenance.....not really accessible.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife