[san rensho]

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.