Specification :

Base oil is the name given to lubrication grade oils initially produced from refining crude oil ( mineral base oil) or through chemical synthesis ( synthetic base oil) . Base oil is typically defined as oil with a boiling point range between 550 and 1050 F, consisting of hydrocarbons with 18 to 40 carbon atoms. This oil can be either paraffinic or napthenic in nature depending on the chemical structure of the molecules.

Base stocks are classified inot various grades including Neutral, Solvent Neutral, Bright Stocks, The most common names are for group I ( SN: Solvent Neutral) , for group II ( N: Neutrals) and group III grade names refer to the viscosity ( 4cst, 6cst, 8cst … ) .