It is known, that physical characteristics traditional oil fuel (diesel fuel, gasoline, kerosene, a gas condensate, etc.), representing multicomponent mixes, depend on structure of hydrocarbons. Recently the increasing distribution is received alternative the fuel, with representing binary mixes oil fuel and a "biodiesel" (phytogenic biological fuel) on the basis of derivatives rapseed (sunflower) oils.

       In the given article the characteristics of binary mixes of a biodiesel engine received by experimental way (methyl ethers of fat acids rapseed oils МERO) and oil fuel are generalized. Certainly, [1,2] experimental data resulted in jobs on density ρ, kinematic ν, and dynamic μ viscosity; to a superficial tension σ, depending on temperature tТ and concentration (volumetric) mT mixtures, represent the certain interest. However, at use of mathematical model of mixing processes and combustions in the cylinder of the engine the greater interest represent analytical dependences for the mentioned above characteristics.

       The density and kinematic viscosity examined binary fuel is well described by the dependences resulted in [3]:
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