ISO 3104-2020 "Test Methods for Petroleum and Its Products, Petroleum Products, Determination of Kinematic Viscosity and Calculation of Dynamic Viscosity of Transparent and Opaque Liquids" specifies a standard method for the measurement of kinematic viscosity of liquid petroleum products. This standard includes operating procedures for manual Glass Viscometers and Glass Capillary Viscometers used in automated units, covering the kinematic viscosity range at temperatures from -20 ° C to + 150 ° C, applicable to viscosity measurement of various liquid petroleum products. The updated version of the standard expands the scope of application to include testing of biodiesel and paraffin diesel, as well as Measuring methods using automated technology. ISO 3104-2020 aims to ensure the accuracy and comparability of measurement results, providing an important basis for the production and application of lubricants and fuels.