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Old 03-29-2013, 06:17 PM   #7
jjrichar
OEM ///Member
 
Join Date: Sep 2009
Location: Australia
Posts: 253
My Ride: 330 Ci convertible
Don't be too worried about some sludge collecting on the magnets. The natural engagement of the clutch packs (which consist of alternating friction disks and steel disks) will produce tiny ferrous particles that will then cling to the magnets. If it's just black sludge, this is a sign of a normally operating transmission. It's if you have a serious build up of clearly silver iron filing type particles, then you really need to worry. Like I said, I change the fluid on both mine and my wife's transmission every 10,000 km. There is always a slight build up of black sludge on the magnets, however the oil will still have a dirty golden look about it. When it's like this, you know that there is always good fluid in it. A lot of people may argue that this is overkill, but all I know is that the transmissions run like new.
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