在拖拉机的使用过程中,有些拖拉机手对经过使用已经报废的旧机油,不是一次全部换完,而是向旧机油内掺入一些新机油,将新旧机油混合后,继续使用。他们认为,这样做,能够节省新机油,降低运行成本。其实,这是不科学的,采用这种方法不仅起不到节省新机油的作用,而且还会适得其反,因为在旧机油内,含有大量的氧 In the process of using the tractor, some tractors do not use the used old oil instead of all at one time, but incorporate some new oil into the old oil and continue mixing the old and the new oil. In their opinion, doing so will save new oil and reduce operating costs. In fact, this is unscientific, using this method not only failed to save the role of new oil, but also be counterproductive, because in the old oil, containing a lot of oxygen