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Extracts (Aromatic)

Refer to solvent extracts of distillates or the residue (residuum) from a vacuum tower; these substances are complex, highly viscous liquids that contain predominately aromatic hydrocarbons covering the carbon number range of C15 to C50.

Group II (N150, N500)

Defined as being more than 90 percent saturates, less than 0.03 percent sulfur and with a viscosity index of 80 to 120. They are often manufactured by hydrocracking, which is a more complex process than what is used for Group I base oils. 

Group I (SN70/80, SN150, SN500, BS150/160)

Classified as less than 90 percent saturates, greater than 0.03 percent sulfur and with a viscosity-index range of 80 to 120. The temperature range for these oils is from 32 to 150 degrees F. Group I base oils are solvent-refined, which is a simpler refining process.

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