Pour Point Depressant This kind of lubricant additive is used to decrease the pour point of the oil. T-808A,B Polystyrene Fumaric Acid Copolymer1. DESCIPTION The product applies to the base oil with paraffin base of low and moderate viscosity and high viscosity index.2. SUGGESTED DOSAGE If 0.5% of product is added to base oil 150SN, the solidifying point of base oil decrease to 12°C.3 ...