Base Oil SN 100 SN100 is a light base oil with its parameters being at the low end for lubricant stock. It is a Group I base oil made by further processing vacuum distillates of specific crude oil fractions. It is mostly used in lubricant and lubricant additives production.Base Oil SN 100 SN100 is a light base oil with its parameters being at the low end for lubricant stock. It is a Group I base oil made by further processing vacuum distillates of specific crude oil fractions. It is mostly used in lubricant and lubricant additives production.