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What flows through the hose that connects to the valve cover of a 1990 525?

It appeared to have been leaking but now i saw that the part description was "breather hose" so im not so sure if it was leaking now....

thanks :)
 

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pcv?
 

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It's the crankcase breather hose which can and will leak oil. Air is what mostly flows through the hose (basically a big vac hose) but it is accompanied by oil. Those hoses get old, dry rotted and cracked from heat.
 

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in other words blow by.. just replace the hose no worries..
 
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