Recycled base oil is obtained by collecting and treating used lubricating oils from engines and industrial machinery. Through processes such as filtration, dehydration, distillation, and hydrotreatment, impurities like sludge, water, and metals are removed. The result is a clean, high-quality base oil with properties comparable to virgin oils. Offering strong viscosity, thermal stability, and additive compatibility, it is widely used in lubricants, hydraulic oils, greases, and transformer fluids while providing significant environmental and economic benefits.