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I agree with Blue on this one. Little pieces of plastic in the oil filter are fairly normal, I get them all the time.
What you are doing is the conservative thing to do, but if it were me, I'm not sure that I would dig into the engine assuming it's an imminent IMSB failure just because I found a couple of bits of ferrous metal and a couple of bits of plastic in the oil filter.
If the engine is not making any noise, the first thing I would do is check the camshaft deviation with the Durametric scanner or the Porsche factory scanner. Camshaft deviation is an early warning sign of a bad IMSB. If there is no camshaft deviation, I would monitor the engine. After 500 miles, I would take out the oil filter and see if I was still getting any ferrous metal in it. If not, I would check it again after another 500 miles. At the same time, I would again check the camshaft deviation.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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