Converting to a PCV ventilation system would be the permanent solution. It eliminates the road draft tube, and the better systems use a sealed oil fill cap and draw filtered ventilation air from the "clean" side of the air filter. I did dozens of that type of conversion back in the mid-1970's when California mandated that all vehicles had to be retrofitted to a closed crankcase system. The crankcase vapors will be drawn into the intake and purged through the muffler and tailpipe.
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!