Abstract: The use of lubricants that are based on vegetable oils is increasing rapidly due to their biodegradability, low ecotoxicity and excellent tribological properties. Bio based lubricants have lower coefficient of friction, improved wear characteristics, a higher viscosity index, and lower volatility and flashpoints than mineral based oils, Properties of the Bio-based based lubricants could be enhanced by adding additives and diluting with other synthetic oils. However in many cases additives and synthetic fluids are not sufficient. In such occasions chemical modification is a better alternative.