Originating in 1993, the best grade of petroleum base oil, since they are fully produced by Hydrocracking, Hydro isomerization, and Hydro treating, which make these oils purer. API defines group III as “base stocks contain greater than or equal to 90 percent saturates and less than or equal to 0.03 percent sulfur and have a viscosity index greater than or equal to 120”. This group may be described as Synthetic Technology oils or Hydro-Cracked Synthetic oil. However, some oil companies may call their products under this group as synthetic oil.
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