Pourpoint (low temperature behaviour)
The low temperature behaviour of lubricating oils is specified by the pour point. The pour point is very similar to the formerly used solidifying point and it provides an indication about reaching the flow limit. After dewaxing, base oils have a pour point of ca. -9°C to ca. -15°C
The pour point characterises the cold behaviour of lubricating oils. It also serves as an indication of reaching the flow limit.
Even lower values can be reached with the addition of so-called flow improvers called “pour point depressants”. These should prevent small paraffin crystals from combining and forming larger crystals and thus keep the oil flowing.