Uses of base oil sn500 Base oil sn500 use in manufacturing of many lubricants oil , who produce base oil mostly use sn500 as additive in their other product also blenders and compounders are other user of base oil different grades as well as sn500 , mostly base oil add from 1% up to 20% as additive to other products . base oil use in different oil as well is engine oil , motor oil , hydraulic oil , gear oil etc.