filter changed 5/22/2010.
fluid was changed 5/22/2010, 7/3/2010 (flushed it like 4 times because the pan was leaking from uneven torque)
just drained all the fluid from the pan yesterday and added about 3.5 liters. I did not notice anything in the bottom off the pan. Today on my lunch break from work it was fine then it started again the next time I turned off the engine and put it in reverse.

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1990 190E 3.0L