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Sounds like your are describing a modification to the dipstick guide tube.
Any hole to the environment is a "vacuum leak" I'm curious about the hole though seems would suck in cold air and actually risk freezing any water in the separated oil coming into the dipstick tube back to the sump.
–awr–
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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