So I just finally got the transmission bolt off after about 3 days. its a 5sp w58... and my question is, when me and my brother got it off there was a bunch of silver gunk on the bolt (believe it's magentic) and when i rubbed it against my fingers i could feel shards of tiny metal pieces and it left sparkly pieces on my hands even after washing... is a little bit of this normal after over 100k? was told it was changed when i got the car but finally decided to change it anyways and the fluid is really really dirty... any ideas?