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When I 1st bought my preowned 99 Boxster. I had about the same....I believe it was sitting for a long time as well. I removed the oil pan and found some in the bottom of the pan. Cleaned it all up and filter has been pretty clean since. I think it could residual metal from past years. I did how ever replace my IMS. the race seals were torn up and there was signs of beginning wear. Good Luck. V
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