1. The requirements of this standard shall apply to liquids, particularly petroleum products. They should not be applied to liquids whose properties and composition may vary during the test. 2. The Saybolt-Univérsal vlscosimsyro will be used in the testing of products with a viscosity greater than 32 sec (Saybolt-Univérsal). No: an upper viscosity limit has been established for this viscometer; However, products with drain times greater than 1000 sec (Saybolt-Universal) will be more conveniently tested in the Saybolt-Furol viscometer. 3. The Saybolt-Furol viscometer will be used in the testing of products with a viscosity greater than 25 seconds (Saybolt-Furol). The drain time measured in the Saybolt-Furol viscometer is approximately one tenth of the time in the Saybolt-Furol viscometer. Universal.