Viscosity index calculator

The determination of the viscosity index is based on two oil types with the same starting viscosity and strongly diverging changes in viscosity as temperature rises.  The oil showing a strong temperature dependence is assigned the viscosity index 0, whereas the oil with a lower change in viscosity is assigned the viscosity index 100. The viscosity index according to DIN ISO 2909:2004‑08 is calculated by comparing the change in viscosity of an oil with the two oils as a reference.

The calculations on this website are based on general experience and knowledge acc. to DIN ISO 2909:2004‑08 at the time of publication and are for information only. The information does not constitute any statement as to specifications, assurance of properties/warranties or the suitability of products for specific applications. All information is subject to change and does not claim to be exhaustive, correct or accurate. Klüber products are continually improved. Therefore, Klüber Lubrication reserves the right to change all the technical data at any time without notice.