There are several different types of additives in synthetic oils, and their goals can vary. Additives are used to enhance specific properties of oil, such as its ability to protect engine parts or maintain viscosity. A common type of additive is detergent, which can be found in virtually all synthetic oils offering high-quality deposit removal capability. Another example would be additives that help maintain viscosity, making the oil more resistant to temperature variations. In essence, additives are chemicals added to enhance certain aspects of an oil.