raises the temperature of the oil or lubrication fluid and changes the viscosity. Any eventual material transfer or creation of protrusions above the original surface will also reduce the ability to retain a protective lubrication thickness. A proper protective lubrication thickness can be assisted or retained by: Surface cavities or small holes can create a favorable geometric situation for the oil to retain a protective lubrication thickness in the contact zone. Cohesive forces on the surface can increase the chemical attraction between the surface and lubricants and enhance the lubrication thickness. Oil additives may reduce the tendency for galling or adhesive wear. See also References Tribology Materials degradation Mechanical engineering Materials science Surface science de:Fressen (Technik)