im' sorry but I have to object, venting the PCV to the atmosphere does NOT build up fumes and does NOT deteriorate your oil, it just does not burn the unburnt fuel mixture..The PVC stands for Positive Crankcase Ventilator. Its hose is connected to the air filter housing so the air intake provides suction to ventilate the crankcase so corrosive fumes and moisture dont stay in the engine. It also sucks the polution causing fumes into the air intake and burns them so they dont pulute the air. If you disconnect the hose, no suction is present, and fumes build up in engine crankcase, causing rapid deteration of engine oil due to gas that seeps past the pistion rings into the crankcase, and delutes the oil so in about a month, instead of having a 10W 40 oil, you have a 10W 25 oil, so less luberacant for engine, more weare!!!! PLUS YOU ARE NOW THE FILTER for the polution!!!!!!!!!!