Came from engine vent on WR400?

Im in the process of putting back together my WR400 when I found this problem. The engine vent was run to the air box so I disconnected it and when I did this oily brown liquid came from the vent line. In all the years of riding Ive never seen this before. Does anyone have an idea of what this is? Maybe the hose was collecting oil and water got in it? Not sure.

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