Crude oil reaches boiling point after entering the refining stage. The result of this refinement will be three types of products:
1. Light products such as gasoline, diesel and kerosene
2. Heavy products such as heavy oil and tar
3. Lube Cut which is the material used to produce lubricants.
Once Lube cut is obtained, it is waxed and de-aromatized to make base oil. This is the most common way to produce base oil. The product of this process is called mineral base oil. Mineral base oils are divided into three categories: Group 1, Group 2 and Group 3, which are also known by the same names in the global oil market. Group 1 has the easiest, and group 3 has the most difficult production method. Therefore, the prices of each group are determined accordingly. That is, group 1 is the cheapest and group 3 is the most expensive mineral base oil. The color, viscosity index and the amount of sulfur present in the mineral base oil will determine the quality as well as the price. It is worth mentioning that less amount of sulfur is preferred.