Measurements have been made on the kinematic viscosity at 20-80A degrees C and on the upper heat of combustion of methyl esters of fatty acids from rapeseed, mustard, and colza oils and the oil of oily radish, as well as the ethyl esters of rapeseed oil. A method is proposed for calculating the viscosity of a mixture of esters from the fatty-acid composition. Matched data have been obtained on the specific heat of combustion of plant oils and their esters.