A little oil vapor might condense and drip, but it's not really a big deal. The draft tube doesn't start functioning as a flow-through vent until about 30 MPH road speed is reached to get enough air speed past the end of the tube to create a vacuum. Before that, most of the vapors and blowby gases escape out the top through the vented oil fill cap or the slots in the valve cover on some models.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!