2. The so-called waste engine oil means that the oil is mixed with impurities such as moisture, dust, other miscellaneous oil and metal powder produced by the wear of machine parts, which leads to black color and increased viscosity. The regeneration of waste engine oil is to remove impurities in engine oil by means of precipitation, distillation, acid washing, alkali washing and filtration. It is a toxic substance and a solid hazardous waste that is explicitly prohibited by the state. It is strictly forbidden to buy and sell waste engine oil at will, and it should be handled by qualified waste engine oil treatment enterprises.

3. Diesel oil is a mixture of light petroleum products and complex hydrocarbons (about 10 ~ 22 carbon atoms). Diesel fuel. It is mainly made from diesel oil fractions produced in crude oil distillation, catalytic cracking, thermal cracking, hydrocracking, petroleum coking and other processes; It can also be made from shale oil processing and coal liquefaction. It is divided into light diesel oil (boiling point range is about 180 ~ 370℃) and heavy diesel oil (boiling point range is about 350 ~ 4 10℃). Widely used in large vehicles, railway locomotives and ships.