Oil chemistry and engine technology have evolved tremendously in recent years, but you'd never know it from the quick-change behavior of American car owners. Driven by an outdated 3,000-mile oil change commandment, they are unnecessarily spending millions of dollars and spilling an ocean of contaminated waste oil.石油化工和发动机技术进步大大改善了，但是很多人还采用过时的5000公里换油的习惯，没有必要地浪费钱和产生大量的废油。
The majority of automakers today call for oil changes at either 7,500 or 10,000 miles(英里换算成公里要乘上1.6，所以是1万2到1万6千公里), 现在大多数汽车通常要求每1.2万公里到1.6万公里换一次机油。and the interval can go as high as 15,000 miles in some cars. 有些车可以可以开24000公里才需要换油。Yet this wasteful cycle continues largely because the automotive service industry, while fully aware of the technological advances, continues to preach the 3,000-mile gospel as a way to keep the service bays busy. As a result, even the most cautious owners are dumping their engine oil twice as often as their service manuals recommend.但是汽车服务商仍然5000公里给你换一次机油，为的是他们有活干，能赚钱，结果导致消费者无谓地比手册上建议多一倍以上次数地去换机油。
，经常回去
