Gear oil is essential to ensure that your gearing is adequately lubricated, thereby providing the best possible conditions for a long service life. Gear oil comes just like so many other oils with different values that it is important to know, to choose the right oil for machine gearing - If in doubt, it is always best to consult your manual, service book or service workshop. What one should pay particular attention to when choosing oil is the viscosity in cold and hot use as well as the APIs - the additives that have an impact on performance and service life in particular.