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购买使用劣质机油，劳民伤财，欲省钱怕吃亏结果总是吃亏，劣质机油为过街老鼠，应当人人喊打，一旦受骗应立即付诸法律。
Buy low-grade oil, waste of money, want to save money afraid of losing the result is always a disadvantage, low-grade motor oil for the mouse across the street, everyone should shout, once deceived should be immediately put into law.