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after a considerable period of time, oil, gas and other PCV valves in its internal deposition, PCV into clay colloid valve jam, thereby improving the crankcase internal gas pressure.天长日久,机油、汽油及其它浓缩物在PCV阀内部沉积成油泥胶体,造成PC V阀堵塞,从而提高了曲轴箱内部的气体压力。