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GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
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Supposedly they help oil droplets precipitate out of the vapors in the crankcase, thus reducing windage losses. The part number disappeared in the mid '70s, so Porsche must have felt there was good reason to ditch them - either they didn't really do much of anything, or they thought better of the idea.
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Several BMWs
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