production , supply and development of lubricating oils for domestic use have been done by using base oils which are prodeuced in the country , but the additives which are used still imported . Research on the use of kapok seed oil as a viscosity index improver additive for lubricating oil is as an effort for suply and development of lubricating oil additive which is produced in the country . Results of physcal and chemical properties analyses show that kapok seed oilcan be used as a viscosity index improver additive .