What would the consesus be on a "normal" amount of metal fuzz on the drain plug? Should the little magnet still be visible or is a larger mound of metal goo acceptable?
The 'Bum says:
A modest amount of FUZZ, soft-feeling, is fine. ANY feelable sharp particles are cause for further inspection. NOTE that fairly large amounts of FUZZ, soft-feeling, after maybe only a few thousand miles since an oil change (and fuzz removal), CAN indicate that the transmission is failing....and for the circlip-less versions, indicate that the 5th gear bearing is deteriorating, and the transmission really should be overhauled and the circlip installed.
He also has a test here
that should either give you warm fuzzies or a sinking feeling in your stomach.