viscosity modifiers

Viscosity modifiers are additives used in motor oils to help keep the oil's thickness consistent across different temperatures. At cold temperatures, they prevent the oil from becoming too thick, ensuring the engine starts smoothly. In hot conditions, they prevent the oil from becoming too thin, maintaining proper lubrication. These additives are often special polymers that expand or contract depending on the temperature, helping the oil perform effectively in a wide range of environments. Essentially, viscosity modifiers improve a motor oil’s ability to protect your engine under various operating conditions.