The analysis of lubricating greases on the roller bearing test apparatus FE 9 is carried out to determine the upper service temperature limit under practical test conditions. According to DIN 51825 for lubricating greases K (roller bearing greases) a test run with 5 bearings at the desired upper temperature at 6000 rpm and 1,5 kN axial load has to be passed (F50 = 100 h).