Borated fatty acid esters of glycerol, useful as friction reducing agents in lubricating compositions for use in internal combustion engines, are stabilized against hydrolysis by reacting the borated ester with an alkyl or alkenyl succinimide, for example polyisobutenyl succinimide. The stable borated complex can be incorporated in oils of lubricating viscosity to provide lubricating oil compositions suitable for use in internal combustion engines which will reduce the fuel consumption of the engines.
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