An apparatus 1s described for measuring the viscosity of coal liquids at low temperature. Viscosity measurements have been obtained as a function of temperature for three SRC coal liquids down to a little above their pour points. Viscosity data shows straight line behavior on an ASTM D-341 chart as temperature 1s lowered. A simple prediction technique for this behavior has been proposed. Pour point temperature of the fuel aids definition of a low temperature limit of measurable viscosities.