RecurDyn/EHD is used in the crank shaft, the bearing of cam shaft, the motion of considering oil film. RecurDyn/EHD analyzes the pressure and force according to the thickness of oil film from the motion information between the rigid body and the flexible body. Also, the pressure applied to the surface of flexible body is defined by the forces type in nodes using the MForce concept. It is possible to deform the flexible body due to a dynamic pressure load. RecurDyn/EHD uses the E-CFD solver of RecurDyn and the algorithm provided by Magna Steyr.