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The formation of a hydrodynamic lubrication is the essential condition for any friction bearings in combustion engines for optimum performance. The shaft and the bearing are separated by a thin sustainable lubrication film, which prevents a direct metal to metal contact. The resulting fluid friction allows for a low frictional loss and the prevention of wear under normal operating conditions. The hydrodynamic load capacity of the bearings is a result of an oil flow, caused by the rotating shaft and/or bearing within the viscous medium. Depending on the gap geometry (shaft eccentricity) a hydrodynamic pressure is built up in the lubrication film. This pressure separates the surfaces that define the lubrication film and thus equilibrates the external bearing load. However, the local pressure inside the lubrication film will cause local deformations of the shaft and bearing, which again will affect the pressure build-up due to a change of the gap geometry.