In order to obtain the kinematic viscosities of biodiesel fuels at temperatures up to 300 degrees C, a modified Saybolt viscometer was designed. The viscometer was used to measure the efflux times for 60 ml of methyl esters of canola and soy, and ethyl esters of fish-oil. The Modified Saybolt Viscometer was calibrated using a standard oil and can be used to measure the kinematic viscosity to within 0.056 mm(2)/s with 2% repeatability. Using the measured densities over the same temperature range, the dynamic viscosities were obtained. (c) 2005 Elsevier Ltd. All rights reserved.