Abstract: Compared with traditional mineral-based base oil and PAO6, coal-based base oil does not contain sulfur and aromatic hydrocarbons but has excellent low-temperature performance, and can be used as an ideal raw material for lubricating oil. Mixed coal-based base oil A and B with a ratio of 65:35 was used as composite base oil. Based on the study of the effect of the amount of additives on the pour point and kinematic viscosity of the composite base oil, the best composition was determined as follows: pour point depressant of 0.5%, composite agent of 9%, and thickener of 9%, respectively. The results showed that the main physical and chemical properties of the coal-based SN 5W-30 gasoline engine oil met the requirements of SN 5W-30 gasoline engine oil standard, and had good low temperature starting performance and mechanical wear resistance.

Key words: Coal-based base oil, lubricating oil, pour point, viscosity