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The vent tube that goes to the air cleaner is to handle blowby that isn't taken care of by the Positive Crankcase Ventilation valve. The PCV valve could be plugged shut so replace it first. If that doesn't help route the hose that goes into the air cleaner to a container or with an extension put on it, route it outside the engine compartment. Otherwise, the oil will make a mess not to mention blocking the air filter.