... technology, it recycle used engine oil to be light base oil and heavy base oil.2) cost ... This includes 4-8% diesel and gasoline mixture, 38-42% light base oil and 37-43% heavy base oil ... 100 degree at 0.098Mpa, have water and some light fractions separated, and collected in water tank. Step3 ... medium temperature in the heated distillation plant, the light base oil fraction is distilled and cooled and then ...