All lubricants and Newtonian fluids exhibit an increase in viscosity as temperatures decrease. At a certain (very low) temperature, a lubricant may solidify also and cease to flow, and thus fail to lubricate.
Pour Point is therefore measured typically with lubricants, wherein Pour Point is the lowest (coldest) temperature that a fluid will still flow, though at a low flowability rate. Normally, Pour Points of mineral-based lubricants are below zero (0) degrees Centigrade (example -10oC); synthetic lubricants, on the other hand, can provide pour points as low as -30 to -40oC.
While most lubricant applications are at elevated temperatures, Pour Point is significant property to consider for cold storage applications, and the food and beverage industries.