有些拖拉机手对已经报废的旧机油,不是一次换完,而是向旧机油内再掺入一部分新机油,混合后继续使用,这种做法是不对的。因为,旧机油中含有氧化能力强的物质,新旧机油混合后,这些物质可加速新机油的氧化变质,从而降低新机油的使用效果和使用时间。据试验,在拖拉机中如果一次全部加上新机油,一般可使用1500多小时;而将一半新机油掺入一半旧机油中混合使用,使用时间仅有200小时。新机油虽少用一半,但使用时间却不足全部新机油 Some tractor hand on the old oil has been scrapped, not a replacement, but to the old oil and then incorporated in a new part of the new oil, continue to use after mixing, this approach is wrong. Because, the old oil contains strong oxidizing substances, old and new oils mixed, these substances can accelerate the oxidation of new oil deterioration, thereby reducing the use of new oil and the use of time. According to the test, in the tractor if you add all the new oil at one time, you can generally use more than 1,500 hours; and half of new oil mixed with half of the old oil mixed use, use time is only 200 hours. Although less than half the new oil, but the use of time but less than all of the new oil