Base oils, also known as lubricating oils, are used as a base for the formulation of lubricants, hydraulic fluids, and other products. There are several different grades of base oils, which are classified based on their viscosity and refining process. Some common base oil grades include:
Group I base oils: These are the most basic and least refined base oils, and are typically made from lower-quality crude oil. They have a relatively high level of impurities and are not commonly used in high-performance lubricants.
Group II base oils: These base oils are of a higher quality than Group I oils, and are made from more refined crude oil. They have a lower level of impurities and are used in a wide range of lubricants and other products.



