Fuchs Schmierstoffe is developing, within the DryFiciency project, a unique synthetic lubricant for high-temperature heat pumps. This lubricant is chemically stable when combined with OpteonMZ, which is a novel, non-flammable and non-toxic new refrigerant from Chemours, that is not subject to the F-gas regulation. The lubricant is being used for two compressor technologies in DryFiciency project - an adapted screw compressor by Bitzer and a new piston compressor technology by Viking Heat Engines.