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my car (and many of the BMw's using that cap and tank) had blowby that escaped the system all over in the area it was mounted. I always thought the breather on the cap should only allow for a pressure balance under hard workload, but since this cap allowed actual fluid to escape the system and get all over the passenger side of the engine compartment I considered that a leak, since no engineer in the right mind would intentionally want oil out of the system without giving it a path away form anything hot. The fix I used complete stops anything outside of air to come out of the tank, since the new tank captures any blowby and lets it go back into the system.
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