Corn. fatty acid Me ester (FAME) was added to corn. gas oil and used for driving the Diesel engine equipped with modern common rail-type fuel injection system operated under std. conditions. Engine output torque, exhaust gas quality (particulate matter) and changes of quality of lubricating oils (viscosity, acid no., oxidn. stability) were detd. Applicability and limitations of FAME addn. to the gas oil were evaluated. No substantial contraindications were given.