汽车、拖拉机及各种型号柴油机均采用强制式润滑系。润滑系在工作中,机油内的金属屑、胶质积炭、杂质、灰尘等不断增加,脏水及其它油料也不断混入,机油会逐渐变脏甚至变质,需要及时更换新机油。许多机器使用说明书都明确提出了机油更换周期,有些机务管理部门和使用单位对更换周期也有明确规定。但硬性规定机器工作多长时间或消耗多少燃油更换一次曲轴箱的机 Automobiles, tractors and various types of diesel engines are mandatory lubrication system. Lubrication system at work, the oil within the metal debris, plastic coke, impurities, dust and so on continue to increase, dirty water and other fuel is also constantly mixed, the oil will gradually become dirty or even deterioration, the need for timely replacement of new oil. Many machine manuals clearly put forward the oil replacement cycle, some maintenance department and the use of units on the replacement cycle is also clearly defined. But it’s hard to specify how long the machine will work or how much fuel it needs to replace the crankcase machine