The New And Improved Unofficial R65 Forum V2
Technical Discussion => R65 Technical FAQ/Procedures => Topic started by: Barry on March 25, 2010, 12:24:49 PM
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(https://bmwr65.org/smf/proxy.php?request=http%3A%2F%2Fwww.bmwr65.org%2Fhtdocs%2Fyabbfiles%2FAttachments%2Foil_drain.jpg&hash=b2e29d7062c4b60249654d605596aa3e7e1cd048)
The oil diagram came from this document originally published in early 1979. It describes the breather function and return of condensed oil vapour via that drain hole
http://www.omnilex.com/public/bmw78/boxloob.pdf
(from the thread Engine breather hole (http://www.bmwr65.org/cgi-bin/yabb2/YaBB.pl?num=1269278421/0))