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A modern HD-Diesel engine for construction machines, Liebherr D 934L (120kW) was set-up for a monofuel operation with crude, cold pressed rapeseed oil (ROR)*). The engine was equipped with a supplementary fuel filtration, supplementary engine & fuel heating for cold start and an appropriate fuel temperature control for the engine operation. A special lube oil was applied. After an extensive basic research of emissions including nanoparticles and energy consumption some adaptations of engine setting were performed: modification of the camshaft to eliminate the internal EGR (same valve timing and lift), earlier start of injection (SOI) at high- and full load, application of a combined exhaust gas aftertreatment system DPF+SCR, testing of DPF+SCR according to the VERT quality verification procedure.