compositions comprising silicone fluids are formulated to provide improved metal - to - metal lubrication . such lubricating compositions comprise a major amount of one or more siloxane polymer selected from dimethyl siloxane polymers and / or phenylmethyl dimethyl siloxane copolymers , and lesser amounts of synthetic and / or bio - based ester co - fluid , and an alkoxylated aliphatic polyamine derivative . unexpectedly , the compositions show a significant improvement in metal - to - metal lubrication , performing better than either the silicone fluids alone or and a combination of silicone with - ester and or silicone with - alkoxylated aliphatic polyamine combinations .