NOVELTY - Reducing aqueous separation in emulsion composition comprises: providing emulsion composition comprising fuel composition comprising biorenewable fuel, water, and oil of lubricating viscosity; and providing to emulsion composition dispersant system consisting of first dispersant comprising at least one relatively low molecular weight hydrocarbyl-substituted succinimide, and second dispersant comprising at least one relatively high molecular weight dispersant including hydrocarbyl-substituted succinimides, hydrocarbyl-substituted amines or Mannich base adducts.    USE - The methods are useful for: reducing aqueous separation in emulsion composition; and lubricating an engine (claimed).    ADVANTAGE - The methods prevent or minimize aqueous phase separation in biorenewable fuels.    DETAILED DESCRIPTION - Reducing aqueous separation in an emulsion composition comprises: providing an emulsion composition comprising a fuel composition comprising a biorenewable fuel, water, and an oil of lubricating viscosity; and providing to the emulsion composition a dispersant system consisting essentially of a first dispersant comprising at least one relatively low molecular weight hydrocarbyl-substituted succinimide, and a second dispersant comprising at least one relatively high molecular weight dispersant including hydrocarbyl-substituted succinimides, hydrocarbyl-substituted amines or Mannich base adducts derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine, where the hydrocarbyl substituent of each of the first and second dispersants comprise a polyisobutylene group having a number average molecular weight of 800-2500. An INDEPENDENT CLAIM is also included for lubricating an engine operating a fuel composition containing a biorenewable fuel to prevent aqueous phase separation in an emulsion containing a lubricant, the fuel composition, and water, comprising: lubricating the engine with a lubricant composition comprising the dispersant system; and operating the engine on the fuel composition.