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The Mechanism of Action of Lubricating Oil Pour Point Depressants
Classification: Company News
Jan 13,2026
The Mechanism of Action of Lubricating Oil Pour Point Depressants
Pour point depressants, as key additives, are widely used in engine oils, hydraulic oils, and industrial lubricants to improve low-temperature performance and lower pour points. At low temperatures, paraffin wax crystals in the base oil gradually precipitate and aggregate, forming a spatial network structure, causing the oil to lose its fluidity. Pour point depressants improve this problem by "intervening in wax crystal growth."
Changing wax crystal morphology: Pour point depressant molecules can adsorb onto the surface of paraffin crystals, inhibiting their regular growth and transforming the wax crystals from plate-like and needle-like shapes into fine, dispersed particles, preventing the formation of a continuous structure.
Preventing wax crystal aggregation: Through steric hindrance, pour point depressants reduce the mutual attraction between wax crystals, preventing their aggregation and thus maintaining the fluidity of the oil at low temperatures.
Lowering pour point and low-temperature viscosity: Pour point depressants do not directly reduce viscosity, but rather control the wax crystal structure, allowing the lubricating oil to remain pumpable and flowing at lower temperatures, significantly improving low-temperature starting performance.
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