In the past few months I was doing some research on the forums for alternative oil filter systems, and found some posts saying that certain oil filters, including the top of the line NAPA filter used O-rings inside them for by-pass valve seating, and someone else had engine problems when one of these O-rings came loose. If it wasn't on this forum, it might have been on Rennlist or Planet 9. Check around.
Good luck.
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Kippis

986S
991S
Van Diemen RF97
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