Saybolt universal viscosity (SUV), and the related Saybolt FUROL viscosity (SFV), are specific standardised tests producing measures of kinematic viscosity. ''FUROL'' is an acronym for ''fuel and road oil''. Saybolt universal viscosity is specified by the

ASTM ASTM International, formerly known as American Society for Testing and Materials, is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, an ...

D2161. Both tests are considered obsolete to other measures of kinematic viscosity, but their results are quoted widely in technical literature. In both tests, the time taken for 60ml of the liquid, held at a specific temperature, to flow through a calibrated tube, is measured, using a Saybolt viscometer.Viscosity By Different Instruments
Retrieved 2015-11-27 The Saybolt universal viscosity test occurs at , or more recently, . The Saybolt FUROL viscosity test occurs at , or more recently, , and uses a larger calibrated tube. This provides for the testing of more viscous fluids, with the result being approximately of the universal viscosity. The test results are specified in seconds (s), more often than not referencing the test: Saybolt universal seconds (SUS); seconds, Saybolt universal (SSU); seconds, Saybolt universal viscosity (SSUV); and Saybolt FUROL seconds (SFS); seconds, Saybolt FUROL (SSF). The precise temperature at which the test is performed is often specified as well.

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Viscosity Petroleum engineering Units of measurement {{Classicalmechanics-stub