求翻译：　　随着养车知识和经验的积累，很多车主朋友已经可以为自己的爱车进行自主选油。他们普遍认识到，发动机就是汽车的“心脏”，车辆养护最为重要的是发动机的护理，而保养发动机最重要的方法当然是让它得到最有效的润滑。正确使用机油不仅可以使发动机寿命延长，还能节省燃油，否则将适得其反。好的机油，尤其是合成机油除了能保护引擎、减少换油次数外，也能节省汽油开销。如果选择不当或只图一时便宜购买品质低劣的产品，会造成发动机早期磨损、降低发动机使用寿命，严重时还会造成“拉缸、抱瓦”等恶性事故。是什么意思？

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