Can't hurt to tighten it, but you'll only slow down the seepage slightly. The hose is made of stiff plastic and a seep proof seal is unlikely. It is normal for this model to aspirate a small amount of oil. There is another point that seeps. There is a vent hole on the bottom right side of the intercooler. It dribbles oil into the air guide under the radiator and eventually hits the garage floor. There is a service bulletin to install a fitting in the intercooler that vents moisture but keeps the oil seepage down to a minimum.