Freezing point and pour point are indirect indicators of low temperature fluidity of lubricating oil. When the pour point is the oil temperature, oil of paraffin formation in crystallization of network structure in the oil. Reticular formation of the temperature at which a lubricant loss of liquidity, which is the oil pour point. Freezing point is the pour-point oil start flowing slowly heated to the temperature. Generally speaking, oil lower freezing point than the pour point ℃ 2-3.
Since lubricating oil in General in front of the pour point of 10℃ viscosity has increased significantly, therefore the use of oil temperature must be higher than the pour point ℃ 5-10 or dry friction when they start.