thats your breather vent for the transmission gears. Normaly you won't get any oil out of that tube unless the motor has been flipped over. Because your motor has just had some work done, they probablly rolled the motor over a few times while working on it. most likely this will clear up after a few hours of run time. To be on the safe side , check your trans oil level to insure that it has not been over filled or the mechanics flipped the motor and lost some oil.
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