There are few other industries where demands on the gears and bearings are as high as in the wind power sector. For example, gears in wind turbines transmit huge torques of up to 5 MNm. Components are exposed to all kinds of environmental influences. and may operate at different speeds to those originally planned. Selecting the ideal lubricants for a wind turbine can prove a significant challenge, demanding a clear picture of the overall operating conditions, including local wind distribution and the operating mode.