有的拖拉机手常常在旧机油中掺入一些新机油混合后继续使用，以为这样做可以节省机油。其实不然。因为，旧机油含有大量的氧化物，如与新机油混合，会加速新机油的氧化，减少新机油的使用时间和使用效果。据试验，拖拉机一次全部加入新机油，一般可使用1500多个小时，如果新旧 Some tractors often use old oil mixed with some new oil continue to use after mixing, in order to save oil can do so. actually not. Because the old oil contains a lot of oxides, such as mixing with new oil, will accelerate the oxidation of new oil, reduce the use of new oil and the use of results. According to the test, the tractor all at once add new oil, can generally use more than 1500 hours, if the old