Pour Point Depressants: Enhancing Lubrication Performance The Role and Significance of Pour Point What are Pour Point Depressants?Pour point depressants, also known as PPDs, are additives that are added to lubricants such as engine oils, transmission fluids, hydraulic fluids, and greases. They act by lowering the pour point temperature of the base oil or finished lubricant. Pour point is the lowest temperature at which a fluid will flow or can be poured, and it is an important indicator of...