Patra SK - Process
LBO Group III Specification


The API have established five Base Oil groups based on following indices:  

Base Oil Category

Sulfur (%)


Saturates (%)

Viscosity Index

Group I > 0.03 and/or

< 90

80 to 120
Group II ≤ 0.03 and ≥ 90 80 to 120
Group III ≤ 0.03 and ≥ 90 ≥ 120
Group IV

All PolyAlphaOlefins (PAOs)

Group V

All others not included in Groups I,II,III or IV


Index is below 120 are Group III category because:

- Viscosity Index is above Group III limit of minimum of 120
- Sulfur is typically below 10 ppm, below Group Ⅳ maximum of 0.03%

A convenient rule of thumb for classifying API Categories is :
Group I    : Base oils produced by solvent extraction/solvent dewaxing
Group II   : Base oils produced by severe hydrotreating
Group III  : Base oils produced by hydrocracking and/or wax isomerization

YUBASE can be classified in many ways depending on the manufacturing process and products characteristics :
- Group III Base Oil
- VHVI Base Oils (applies to base oils with Viscosity Index above 120)
- Hydrocracked Base Oil
- UCBO (Unconventional Base Oils) This usually applies to base oils with characteristics to API Group II base oils.


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