The W is the next generation of vibrating motors. Its continuous, internal oil-bath lubrication system ensures long life and robust maintenance-free operation. In addition to greatly extending the life of the motor, the hydrodynamic cushioning effect on bearing surfaces created by this unique lubrication system reduces friction, wear, heat, and sound. Sealed, continuous recirculation of lubricating oil maintains a fresh film of oil on all bearing surfaces at all times and prevents entry of contaminants. W motors carry a one-year warranty.