Life time limiting effects in roller bearings and gear wheel applications are wear, sizing, and fatigue damages like micro pitting. These mechanisms are related to a number of parameters: lubrication conditions, surface roughness, and the hardness of the bulk material. Nowadays, Me-DLC coatings like MAXITÓ W-C:H offer surface protection under dry, mixed, and hydrodynamic conditions. This allows the increase of load capacities, respectively the decrease of gearing size. Moreover, a reduction of toxic lubrication additives can be achieved. The performance of the MAXITÓ W-C:H coatings in roller bearings was investigated on the FE8 test rig under mixed friction conditions. The W-C:H was deposited via the PVD technique of magnetron sputtering onto case hardened steel. The coating thickness was varied from 1.5 to 5 m m with respect to optimised wear resistance. The wear was drastically reduced by powers of ten as compared to uncoated roller bearings.