Just drained the tranny fluid on the 12 Honda Oddy. Fluid didn't look too bad for 30K but the drain plug has a lot of residue on it. Glad I did it, was pretty simple. The drain plug must only accept so much residue would it? Then what? Just thinking that it probably should be changed about every two years as I have heard about possible tranny problems. I was thinking maybe the plug should be longer or a filter to accept more floaters.