| OELCHECK test instrument: | ISL Houillon Viscometer, kinematic viscosity |
| Sample quantity: | 3 ml (kinematic viscosity) |
| Unit: | mm²/s for viscosity, none for VI (viscosity index) |
| Test result: | Viscosity 40 °C, viscosity 100 °C, VI (viscosity index) |
| Result range: | Viscosity 40 °C: 1 - 2,000 mm²/s Viscosity 100 °C: 0.8 - 200 mm²/s Viscosity index: 0 - 499 |
| Analysis for: | all oils and fuels |
| Brief description: | The viscosity determination is a description of the pouring behaviour of liquids. The ISL Houillon viscosimeter consists of a 40 °C and a 100 °C tempering bath, each containing 4 capillar viscosimeters. The time the oil requires to travel a certain measuring distance is converted into kinematic viscosity at 40 °C and at 100 °C using the capillary constant. The viscosity values at 40 °C and 100 °C are used to calculate the VI (viscosity index). The higher the VI, the lower the temperature-related change in viscosity. |
| Statement: | The change in viscosity enables conclusions to be drawn on mixture with other oils, impurities such as fuel or soot, VI improver shear or oil thickening due to factors such as oxidation. |
| Underlying test standard: | DIN 51659-3, DIN ISO 2909, ASTM D2270, ASTM D7279 |
