Honda part number 25430-plr-003. Honda doesn't list when this should be replaced. Does anyone have any ideas? It sells for about $14 and appears to be in-line toward the rear of the tranny. I plan on doing my first drain and fill at 30,000 miles, do you think the original filter has picked up a few "wear metals" and should be replaced at this point? I'm not sure how difficult it is to get to; I haven't crawled around looking for it yet.